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Finding the Fourth Proportional to 861,407.88, 1,188,730.98 and 479,434.80

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Solution

The fourth proportional to 861,407.88, 1,188,730.98 and 479,434.80 is: 661,613.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,407.88 : 1,188,730.98 = 479,434.80 : x
  2. Step 2: Convert to fraction form
    861,407.88/1,188,730.98 = 479,434.80/x
  3. Step 3: Cross multiply
    861,407.88x = 1,188,730.98 × 479,434.80
  4. Step 4: Simplify right side
    861,407.88x = 569,918,999,650.10
  5. Step 5: Solve for x
    x = 569,918,999,650.10/861,407.88
  6. Step 6: Final answer
    x = 661,613.40

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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.