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Finding the Fourth Proportional to 15,689.53, 21,651.71 and 8,616.11

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Solution

The fourth proportional to 15,689.53, 21,651.71 and 8,616.11 is: 11,890.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,689.53 : 21,651.71 = 8,616.11 : x
  2. Step 2: Convert to fraction form
    15,689.53/21,651.71 = 8,616.11/x
  3. Step 3: Cross multiply
    15,689.53x = 21,651.71 × 8,616.11
  4. Step 4: Simplify right side
    15,689.53x = 186,553,363.71
  5. Step 5: Solve for x
    x = 186,553,363.71/15,689.53
  6. Step 6: Final answer
    x = 11,890.31

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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.