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Finding the Fourth Proportional to 391,490.60, 587,235.90 and 387,804.20

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Solution

The fourth proportional to 391,490.60, 587,235.90 and 387,804.20 is: 581,706.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,490.60 : 587,235.90 = 387,804.20 : x
  2. Step 2: Convert to fraction form
    391,490.60/587,235.90 = 387,804.20/x
  3. Step 3: Cross multiply
    391,490.60x = 587,235.90 × 387,804.20
  4. Step 4: Simplify right side
    391,490.60x = 227,732,548,410.78
  5. Step 5: Solve for x
    x = 227,732,548,410.78/391,490.60
  6. Step 6: Final answer
    x = 581,706.30

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Similar ratio
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1.5x scale

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.