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Finding the Fourth Proportional to 37,781.70, 52,138.88 and 20,787.70

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Solution

The fourth proportional to 37,781.70, 52,138.88 and 20,787.70 is: 28,687.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    37,781.70 : 52,138.88 = 20,787.70 : x
  2. Step 2: Convert to fraction form
    37,781.70/52,138.88 = 20,787.70/x
  3. Step 3: Cross multiply
    37,781.70x = 52,138.88 × 20,787.70
  4. Step 4: Simplify right side
    37,781.70x = 1,083,847,395.78
  5. Step 5: Solve for x
    x = 1,083,847,395.78/37,781.70
  6. Step 6: Final answer
    x = 28,687.10

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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.