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Finding the Fourth Proportional to 861,686.68, 1,189,104.45 and 479,713.45

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Solution

The fourth proportional to 861,686.68, 1,189,104.45 and 479,713.45 is: 661,991.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,686.68 : 1,189,104.45 = 479,713.45 : x
  2. Step 2: Convert to fraction form
    861,686.68/1,189,104.45 = 479,713.45/x
  3. Step 3: Cross multiply
    861,686.68x = 1,189,104.45 × 479,713.45
  4. Step 4: Simplify right side
    861,686.68x = 570,429,398,119.85
  5. Step 5: Solve for x
    x = 570,429,398,119.85/861,686.68
  6. Step 6: Final answer
    x = 661,991.66

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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.