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Finding the Fourth Proportional to 57,765.20, 86,734.20 and 40,312.40

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Solution

The fourth proportional to 57,765.20, 86,734.20 and 40,312.40 is: 60,528.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,765.20 : 86,734.20 = 40,312.40 : x
  2. Step 2: Convert to fraction form
    57,765.20/86,734.20 = 40,312.40/x
  3. Step 3: Cross multiply
    57,765.20x = 86,734.20 × 40,312.40
  4. Step 4: Simplify right side
    57,765.20x = 3,496,463,764.08
  5. Step 5: Solve for x
    x = 3,496,463,764.08/57,765.20
  6. Step 6: Final answer
    x = 60,528.90

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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.