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Finding the Fourth Proportional to 399,115.20, 598,672.80 and 383,368.80

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Solution

The fourth proportional to 399,115.20, 598,672.80 and 383,368.80 is: 575,053.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,115.20 : 598,672.80 = 383,368.80 : x
  2. Step 2: Convert to fraction form
    399,115.20/598,672.80 = 383,368.80/x
  3. Step 3: Cross multiply
    399,115.20x = 598,672.80 × 383,368.80
  4. Step 4: Simplify right side
    399,115.20x = 229,512,472,928.64
  5. Step 5: Solve for x
    x = 229,512,472,928.64/399,115.20
  6. Step 6: Final answer
    x = 575,053.20

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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.