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Finding the Fourth Proportional to 409,062.80, 613,613.40 and 128,589.20

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Solution

The fourth proportional to 409,062.80, 613,613.40 and 128,589.20 is: 192,889.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,062.80 : 613,613.40 = 128,589.20 : x
  2. Step 2: Convert to fraction form
    409,062.80/613,613.40 = 128,589.20/x
  3. Step 3: Cross multiply
    409,062.80x = 613,613.40 × 128,589.20
  4. Step 4: Simplify right side
    409,062.80x = 78,904,056,215.28
  5. Step 5: Solve for x
    x = 78,904,056,215.28/409,062.80
  6. Step 6: Final answer
    x = 192,889.84

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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.