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Finding the Fourth Proportional to 40,877.70, 61,355.70 and 21,170.40

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Solution

The fourth proportional to 40,877.70, 61,355.70 and 21,170.40 is: 31,775.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,877.70 : 61,355.70 = 21,170.40 : x
  2. Step 2: Convert to fraction form
    40,877.70/61,355.70 = 21,170.40/x
  3. Step 3: Cross multiply
    40,877.70x = 61,355.70 × 21,170.40
  4. Step 4: Simplify right side
    40,877.70x = 1,298,924,711.28
  5. Step 5: Solve for x
    x = 1,298,924,711.28/40,877.70
  6. Step 6: Final answer
    x = 31,775.88

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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.