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Finding the Fourth Proportional to 21,087.76, 29,101.10 and 12,705.88

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Solution

The fourth proportional to 21,087.76, 29,101.10 and 12,705.88 is: 17,534.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,087.76 : 29,101.10 = 12,705.88 : x
  2. Step 2: Convert to fraction form
    21,087.76/29,101.10 = 12,705.88/x
  3. Step 3: Cross multiply
    21,087.76x = 29,101.10 × 12,705.88
  4. Step 4: Simplify right side
    21,087.76x = 369,755,084.47
  5. Step 5: Solve for x
    x = 369,755,084.47/21,087.76
  6. Step 6: Final answer
    x = 17,534.11

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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.