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Finding the Fourth Proportional to 15,511.96, 21,406.98 and 8,437.96

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Solution

The fourth proportional to 15,511.96, 21,406.98 and 8,437.96 is: 11,644.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.96 : 21,406.98 = 8,437.96 : x
  2. Step 2: Convert to fraction form
    15,511.96/21,406.98 = 8,437.96/x
  3. Step 3: Cross multiply
    15,511.96x = 21,406.98 × 8,437.96
  4. Step 4: Simplify right side
    15,511.96x = 180,631,240.96
  5. Step 5: Solve for x
    x = 180,631,240.96/15,511.96
  6. Step 6: Final answer
    x = 11,644.64

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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.