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Finding the Fourth Proportional to 15,511, 21,405.18 and 8,796.76

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Solution

The fourth proportional to 15,511, 21,405.18 and 8,796.76 is: 12,139.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511 : 21,405.18 = 8,796.76 : x
  2. Step 2: Convert to fraction form
    15,511/21,405.18 = 8,796.76/x
  3. Step 3: Cross multiply
    15,511x = 21,405.18 × 8,796.76
  4. Step 4: Simplify right side
    15,511x = 188,296,231.22
  5. Step 5: Solve for x
    x = 188,296,231.22/15,511
  6. Step 6: Final answer
    x = 12,139.53

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.