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Finding the Fourth Proportional to 391,737.60, 587,196.80 and 213,971.20

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Solution

The fourth proportional to 391,737.60, 587,196.80 and 213,971.20 is: 320,733.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,737.60 : 587,196.80 = 213,971.20 : x
  2. Step 2: Convert to fraction form
    391,737.60/587,196.80 = 213,971.20/x
  3. Step 3: Cross multiply
    391,737.60x = 587,196.80 × 213,971.20
  4. Step 4: Simplify right side
    391,737.60x = 125,643,203,932.16
  5. Step 5: Solve for x
    x = 125,643,203,932.16/391,737.60
  6. Step 6: Final answer
    x = 320,733.07

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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.