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Finding the Fourth Proportional to 261,040.20, 391,041.90 and 155,545.80

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Solution

The fourth proportional to 261,040.20, 391,041.90 and 155,545.80 is: 233,009.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,040.20 : 391,041.90 = 155,545.80 : x
  2. Step 2: Convert to fraction form
    261,040.20/391,041.90 = 155,545.80/x
  3. Step 3: Cross multiply
    261,040.20x = 391,041.90 × 155,545.80
  4. Step 4: Simplify right side
    261,040.20x = 60,824,925,169.02
  5. Step 5: Solve for x
    x = 60,824,925,169.02/261,040.20
  6. Step 6: Final answer
    x = 233,009.80

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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.