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Finding the Fourth Proportional to 391,575.40, 587,363.10 and 386,326.60

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Solution

The fourth proportional to 391,575.40, 587,363.10 and 386,326.60 is: 579,489.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,575.40 : 587,363.10 = 386,326.60 : x
  2. Step 2: Convert to fraction form
    391,575.40/587,363.10 = 386,326.60/x
  3. Step 3: Cross multiply
    391,575.40x = 587,363.10 × 386,326.60
  4. Step 4: Simplify right side
    391,575.40x = 226,913,989,388.46
  5. Step 5: Solve for x
    x = 226,913,989,388.46/391,575.40
  6. Step 6: Final answer
    x = 579,489.90

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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.