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Finding the Fourth Proportional to 615,687.60, 921,563.10 and 438,540.60

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Solution

The fourth proportional to 615,687.60, 921,563.10 and 438,540.60 is: 656,408.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,687.60 : 921,563.10 = 438,540.60 : x
  2. Step 2: Convert to fraction form
    615,687.60/921,563.10 = 438,540.60/x
  3. Step 3: Cross multiply
    615,687.60x = 921,563.10 × 438,540.60
  4. Step 4: Simplify right side
    615,687.60x = 404,142,834,811.86
  5. Step 5: Solve for x
    x = 404,142,834,811.86/615,687.60
  6. Step 6: Final answer
    x = 656,408.92

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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.