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Finding the Fourth Proportional to 257,478.90, 386,327.70 and 124,290.60

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Solution

The fourth proportional to 257,478.90, 386,327.70 and 124,290.60 is: 186,488.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,478.90 : 386,327.70 = 124,290.60 : x
  2. Step 2: Convert to fraction form
    257,478.90/386,327.70 = 124,290.60/x
  3. Step 3: Cross multiply
    257,478.90x = 386,327.70 × 124,290.60
  4. Step 4: Simplify right side
    257,478.90x = 48,016,901,629.62
  5. Step 5: Solve for x
    x = 48,016,901,629.62/257,478.90
  6. Step 6: Final answer
    x = 186,488.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.