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Finding the Fourth Proportional to 15,680.58, 21,638.52 and 8,607.12

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Solution

The fourth proportional to 15,680.58, 21,638.52 and 8,607.12 is: 11,877.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,680.58 : 21,638.52 = 8,607.12 : x
  2. Step 2: Convert to fraction form
    15,680.58/21,638.52 = 8,607.12/x
  3. Step 3: Cross multiply
    15,680.58x = 21,638.52 × 8,607.12
  4. Step 4: Simplify right side
    15,680.58x = 186,245,338.26
  5. Step 5: Solve for x
    x = 186,245,338.26/15,680.58
  6. Step 6: Final answer
    x = 11,877.45

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Half scale
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Double scale
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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.