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Finding the Fourth Proportional to 257,547.70, 386,321.55 and 80,053.30

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Solution

The fourth proportional to 257,547.70, 386,321.55 and 80,053.30 is: 120,079.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,547.70 : 386,321.55 = 80,053.30 : x
  2. Step 2: Convert to fraction form
    257,547.70/386,321.55 = 80,053.30/x
  3. Step 3: Cross multiply
    257,547.70x = 386,321.55 × 80,053.30
  4. Step 4: Simplify right side
    257,547.70x = 30,926,314,938.62
  5. Step 5: Solve for x
    x = 30,926,314,938.62/257,547.70
  6. Step 6: Final answer
    x = 120,079.95

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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.