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Finding the Fourth Proportional to 86,431.64, 129,702.12 and 33,839.76

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Solution

The fourth proportional to 86,431.64, 129,702.12 and 33,839.76 is: 50,781.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,431.64 : 129,702.12 = 33,839.76 : x
  2. Step 2: Convert to fraction form
    86,431.64/129,702.12 = 33,839.76/x
  3. Step 3: Cross multiply
    86,431.64x = 129,702.12 × 33,839.76
  4. Step 4: Simplify right side
    86,431.64x = 4,389,088,612.29
  5. Step 5: Solve for x
    x = 4,389,088,612.29/86,431.64
  6. Step 6: Final answer
    x = 50,781.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.