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Finding the Fourth Proportional to 123,730.30, 170,825.20 and 85,034.78

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Solution

The fourth proportional to 123,730.30, 170,825.20 and 85,034.78 is: 117,401.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,730.30 : 170,825.20 = 85,034.78 : x
  2. Step 2: Convert to fraction form
    123,730.30/170,825.20 = 85,034.78/x
  3. Step 3: Cross multiply
    123,730.30x = 170,825.20 × 85,034.78
  4. Step 4: Simplify right side
    123,730.30x = 14,526,083,352.66
  5. Step 5: Solve for x
    x = 14,526,083,352.66/123,730.30
  6. Step 6: Final answer
    x = 117,401.18

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1.5x scale

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.