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Finding the Fourth Proportional to 171,990.20, 257,898.90 and 78,390.20

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Solution

The fourth proportional to 171,990.20, 257,898.90 and 78,390.20 is: 117,545.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,990.20 : 257,898.90 = 78,390.20 : x
  2. Step 2: Convert to fraction form
    171,990.20/257,898.90 = 78,390.20/x
  3. Step 3: Cross multiply
    171,990.20x = 257,898.90 × 78,390.20
  4. Step 4: Simplify right side
    171,990.20x = 20,216,746,350.78
  5. Step 5: Solve for x
    x = 20,216,746,350.78/171,990.20
  6. Step 6: Final answer
    x = 117,545.92

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1.5x scale

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.