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Finding the Fourth Proportional to 391,683.92, 587,344.44 and 316,619.60

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Solution

The fourth proportional to 391,683.92, 587,344.44 and 316,619.60 is: 474,782.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,683.92 : 587,344.44 = 316,619.60 : x
  2. Step 2: Convert to fraction form
    391,683.92/587,344.44 = 316,619.60/x
  3. Step 3: Cross multiply
    391,683.92x = 587,344.44 × 316,619.60
  4. Step 4: Simplify right side
    391,683.92x = 185,964,761,655.02
  5. Step 5: Solve for x
    x = 185,964,761,655.02/391,683.92
  6. Step 6: Final answer
    x = 474,782.73

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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.