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Finding the Fourth Proportional to 261,389.70, 392,125.60 and 111,630.78

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Solution

The fourth proportional to 261,389.70, 392,125.60 and 111,630.78 is: 167,463.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,389.70 : 392,125.60 = 111,630.78 : x
  2. Step 2: Convert to fraction form
    261,389.70/392,125.60 = 111,630.78/x
  3. Step 3: Cross multiply
    261,389.70x = 392,125.60 × 111,630.78
  4. Step 4: Simplify right side
    261,389.70x = 43,773,284,067.19
  5. Step 5: Solve for x
    x = 43,773,284,067.19/261,389.70
  6. Step 6: Final answer
    x = 167,463.69

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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.