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Finding the Fourth Proportional to 128,432.70, 192,645.45 and 58,311.90

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Solution

The fourth proportional to 128,432.70, 192,645.45 and 58,311.90 is: 87,466.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,432.70 : 192,645.45 = 58,311.90 : x
  2. Step 2: Convert to fraction form
    128,432.70/192,645.45 = 58,311.90/x
  3. Step 3: Cross multiply
    128,432.70x = 192,645.45 × 58,311.90
  4. Step 4: Simplify right side
    128,432.70x = 11,233,522,215.86
  5. Step 5: Solve for x
    x = 11,233,522,215.86/128,432.70
  6. Step 6: Final answer
    x = 87,466.22

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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.