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Finding the Fourth Proportional to 398,012.80, 597,019.20 and 131,814.40

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Solution

The fourth proportional to 398,012.80, 597,019.20 and 131,814.40 is: 197,721.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,012.80 : 597,019.20 = 131,814.40 : x
  2. Step 2: Convert to fraction form
    398,012.80/597,019.20 = 131,814.40/x
  3. Step 3: Cross multiply
    398,012.80x = 597,019.20 × 131,814.40
  4. Step 4: Simplify right side
    398,012.80x = 78,695,727,636.48
  5. Step 5: Solve for x
    x = 78,695,727,636.48/398,012.80
  6. Step 6: Final answer
    x = 197,721.60

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Similar ratio
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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.