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Finding the Fourth Proportional to 391,426.60, 587,139.90 and 260,098.60

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Solution

The fourth proportional to 391,426.60, 587,139.90 and 260,098.60 is: 390,147.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,426.60 : 587,139.90 = 260,098.60 : x
  2. Step 2: Convert to fraction form
    391,426.60/587,139.90 = 260,098.60/x
  3. Step 3: Cross multiply
    391,426.60x = 587,139.90 × 260,098.60
  4. Step 4: Simplify right side
    391,426.60x = 152,714,265,994.14
  5. Step 5: Solve for x
    x = 152,714,265,994.14/391,426.60
  6. Step 6: Final answer
    x = 390,147.90

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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.