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Finding the Fourth Proportional to 398,909.80, 598,364.70 and 309,680.20

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Solution

The fourth proportional to 398,909.80, 598,364.70 and 309,680.20 is: 464,520.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,909.80 : 598,364.70 = 309,680.20 : x
  2. Step 2: Convert to fraction form
    398,909.80/598,364.70 = 309,680.20/x
  3. Step 3: Cross multiply
    398,909.80x = 598,364.70 × 309,680.20
  4. Step 4: Simplify right side
    398,909.80x = 185,301,699,968.94
  5. Step 5: Solve for x
    x = 185,301,699,968.94/398,909.80
  6. Step 6: Final answer
    x = 464,520.30

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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.