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Finding the Fourth Proportional to 261,956.70, 392,481.45 and 121,427.10

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Solution

The fourth proportional to 261,956.70, 392,481.45 and 121,427.10 is: 181,930.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,956.70 : 392,481.45 = 121,427.10 : x
  2. Step 2: Convert to fraction form
    261,956.70/392,481.45 = 121,427.10/x
  3. Step 3: Cross multiply
    261,956.70x = 392,481.45 × 121,427.10
  4. Step 4: Simplify right side
    261,956.70x = 47,657,884,277.30
  5. Step 5: Solve for x
    x = 47,657,884,277.30/261,956.70
  6. Step 6: Final answer
    x = 181,930.39

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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.