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Finding the Fourth Proportional to 123,278.31, 170,123.70 and 66,689.67

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Solution

The fourth proportional to 123,278.31, 170,123.70 and 66,689.67 is: 92,031.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,278.31 : 170,123.70 = 66,689.67 : x
  2. Step 2: Convert to fraction form
    123,278.31/170,123.70 = 66,689.67/x
  3. Step 3: Cross multiply
    123,278.31x = 170,123.70 × 66,689.67
  4. Step 4: Simplify right side
    123,278.31x = 11,345,493,412.18
  5. Step 5: Solve for x
    x = 11,345,493,412.18/123,278.31
  6. Step 6: Final answer
    x = 92,031.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.