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Finding the Fourth Proportional to 861,395.85, 1,188,714.42 and 479,422.80

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Solution

The fourth proportional to 861,395.85, 1,188,714.42 and 479,422.80 is: 661,596.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,395.85 : 1,188,714.42 = 479,422.80 : x
  2. Step 2: Convert to fraction form
    861,395.85/1,188,714.42 = 479,422.80/x
  3. Step 3: Cross multiply
    861,395.85x = 1,188,714.42 × 479,422.80
  4. Step 4: Simplify right side
    861,395.85x = 569,896,795,636.78
  5. Step 5: Solve for x
    x = 569,896,795,636.78/861,395.85
  6. Step 6: Final answer
    x = 661,596.87

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.