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Finding the Fourth Proportional to 861,357.60, 1,188,661.64 and 479,384.32

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Solution

The fourth proportional to 861,357.60, 1,188,661.64 and 479,384.32 is: 661,543.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,357.60 : 1,188,661.64 = 479,384.32 : x
  2. Step 2: Convert to fraction form
    861,357.60/1,188,661.64 = 479,384.32/x
  3. Step 3: Cross multiply
    861,357.60x = 1,188,661.64 × 479,384.32
  4. Step 4: Simplify right side
    861,357.60x = 569,825,752,001.49
  5. Step 5: Solve for x
    x = 569,825,752,001.49/861,357.60
  6. Step 6: Final answer
    x = 661,543.77

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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.