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Finding the Fourth Proportional to 666,928.74, 920,478 and 395,149.68

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Solution

The fourth proportional to 666,928.74, 920,478 and 395,149.68 is: 545,375.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,928.74 : 920,478 = 395,149.68 : x
  2. Step 2: Convert to fraction form
    666,928.74/920,478 = 395,149.68/x
  3. Step 3: Cross multiply
    666,928.74x = 920,478 × 395,149.68
  4. Step 4: Simplify right side
    666,928.74x = 363,726,587,147.04
  5. Step 5: Solve for x
    x = 363,726,587,147.04/666,928.74
  6. Step 6: Final answer
    x = 545,375.49

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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.