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Finding the Fourth Proportional to 391,639.20, 587,458.80 and 365,200.80

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Solution

The fourth proportional to 391,639.20, 587,458.80 and 365,200.80 is: 547,801.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,639.20 : 587,458.80 = 365,200.80 : x
  2. Step 2: Convert to fraction form
    391,639.20/587,458.80 = 365,200.80/x
  3. Step 3: Cross multiply
    391,639.20x = 587,458.80 × 365,200.80
  4. Step 4: Simplify right side
    391,639.20x = 214,540,423,727.04
  5. Step 5: Solve for x
    x = 214,540,423,727.04/391,639.20
  6. Step 6: Final answer
    x = 547,801.20

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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.