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Finding the Fourth Proportional to 92,505.20, 138,903.60 and 53,139.20

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Solution

The fourth proportional to 92,505.20, 138,903.60 and 53,139.20 is: 79,792.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,505.20 : 138,903.60 = 53,139.20 : x
  2. Step 2: Convert to fraction form
    92,505.20/138,903.60 = 53,139.20/x
  3. Step 3: Cross multiply
    92,505.20x = 138,903.60 × 53,139.20
  4. Step 4: Simplify right side
    92,505.20x = 7,381,226,181.12
  5. Step 5: Solve for x
    x = 7,381,226,181.12/92,505.20
  6. Step 6: Final answer
    x = 79,792.55

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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.