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Finding the Fourth Proportional to 398,277.60, 598,582.80 and 391,279.20

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Solution

The fourth proportional to 398,277.60, 598,582.80 and 391,279.20 is: 588,064.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,277.60 : 598,582.80 = 391,279.20 : x
  2. Step 2: Convert to fraction form
    398,277.60/598,582.80 = 391,279.20/x
  3. Step 3: Cross multiply
    398,277.60x = 598,582.80 × 391,279.20
  4. Step 4: Simplify right side
    398,277.60x = 234,212,999,117.76
  5. Step 5: Solve for x
    x = 234,212,999,117.76/398,277.60
  6. Step 6: Final answer
    x = 588,064.70

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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.