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Finding the Fourth Proportional to 257,426.60, 386,139.90 and 91,231.40

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Solution

The fourth proportional to 257,426.60, 386,139.90 and 91,231.40 is: 136,847.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,426.60 : 386,139.90 = 91,231.40 : x
  2. Step 2: Convert to fraction form
    257,426.60/386,139.90 = 91,231.40/x
  3. Step 3: Cross multiply
    257,426.60x = 386,139.90 × 91,231.40
  4. Step 4: Simplify right side
    257,426.60x = 35,228,083,672.86
  5. Step 5: Solve for x
    x = 35,228,083,672.86/257,426.60
  6. Step 6: Final answer
    x = 136,847.10

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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.