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Finding the Fourth Proportional to 261,043.70, 391,565.55 and 171,230.90

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Solution

The fourth proportional to 261,043.70, 391,565.55 and 171,230.90 is: 256,846.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,043.70 : 391,565.55 = 171,230.90 : x
  2. Step 2: Convert to fraction form
    261,043.70/391,565.55 = 171,230.90/x
  3. Step 3: Cross multiply
    261,043.70x = 391,565.55 × 171,230.90
  4. Step 4: Simplify right side
    261,043.70x = 67,048,121,535.50
  5. Step 5: Solve for x
    x = 67,048,121,535.50/261,043.70
  6. Step 6: Final answer
    x = 256,846.35

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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.