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Finding the Fourth Proportional to 261,151.55, 391,783.71 and 81,233.54

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Solution

The fourth proportional to 261,151.55, 391,783.71 and 81,233.54 is: 121,867.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,151.55 : 391,783.71 = 81,233.54 : x
  2. Step 2: Convert to fraction form
    261,151.55/391,783.71 = 81,233.54/x
  3. Step 3: Cross multiply
    261,151.55x = 391,783.71 × 81,233.54
  4. Step 4: Simplify right side
    261,151.55x = 31,825,977,677.63
  5. Step 5: Solve for x
    x = 31,825,977,677.63/261,151.55
  6. Step 6: Final answer
    x = 121,867.85

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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.