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Finding the Fourth Proportional to 642,138.59, 886,157.72 and 387,440.57

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Solution

The fourth proportional to 642,138.59, 886,157.72 and 387,440.57 is: 534,671.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,138.59 : 886,157.72 = 387,440.57 : x
  2. Step 2: Convert to fraction form
    642,138.59/886,157.72 = 387,440.57/x
  3. Step 3: Cross multiply
    642,138.59x = 886,157.72 × 387,440.57
  4. Step 4: Simplify right side
    642,138.59x = 343,333,452,146.70
  5. Step 5: Solve for x
    x = 343,333,452,146.70/642,138.59
  6. Step 6: Final answer
    x = 534,671.89

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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.