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Finding the Fourth Proportional to 261,385.20, 391,559.40 and 155,890.80

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Solution

The fourth proportional to 261,385.20, 391,559.40 and 155,890.80 is: 233,527.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,385.20 : 391,559.40 = 155,890.80 : x
  2. Step 2: Convert to fraction form
    261,385.20/391,559.40 = 155,890.80/x
  3. Step 3: Cross multiply
    261,385.20x = 391,559.40 × 155,890.80
  4. Step 4: Simplify right side
    261,385.20x = 61,040,508,113.52
  5. Step 5: Solve for x
    x = 61,040,508,113.52/261,385.20
  6. Step 6: Final answer
    x = 233,527.02

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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.