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Finding the Fourth Proportional to 21,086.40, 29,101.20 and 12,139.20

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Solution

The fourth proportional to 21,086.40, 29,101.20 and 12,139.20 is: 16,753.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,086.40 : 29,101.20 = 12,139.20 : x
  2. Step 2: Convert to fraction form
    21,086.40/29,101.20 = 12,139.20/x
  3. Step 3: Cross multiply
    21,086.40x = 29,101.20 × 12,139.20
  4. Step 4: Simplify right side
    21,086.40x = 353,265,287.04
  5. Step 5: Solve for x
    x = 353,265,287.04/21,086.40
  6. Step 6: Final answer
    x = 16,753.23

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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.