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Finding the Fourth Proportional to 21,689.70, 29,929.47 and 12,128.59

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Solution

The fourth proportional to 21,689.70, 29,929.47 and 12,128.59 is: 16,736.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.70 : 29,929.47 = 12,128.59 : x
  2. Step 2: Convert to fraction form
    21,689.70/29,929.47 = 12,128.59/x
  3. Step 3: Cross multiply
    21,689.70x = 29,929.47 × 12,128.59
  4. Step 4: Simplify right side
    21,689.70x = 363,002,262.48
  5. Step 5: Solve for x
    x = 363,002,262.48/21,689.70
  6. Step 6: Final answer
    x = 16,736.16

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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.