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Finding the Fourth Proportional to 15,689.47, 21,651.54 and 8,975.17

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Solution

The fourth proportional to 15,689.47, 21,651.54 and 8,975.17 is: 12,385.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,689.47 : 21,651.54 = 8,975.17 : x
  2. Step 2: Convert to fraction form
    15,689.47/21,651.54 = 8,975.17/x
  3. Step 3: Cross multiply
    15,689.47x = 21,651.54 × 8,975.17
  4. Step 4: Simplify right side
    15,689.47x = 194,326,252.26
  5. Step 5: Solve for x
    x = 194,326,252.26/15,689.47
  6. Step 6: Final answer
    x = 12,385.78

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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.