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Finding the Fourth Proportional to 123,485.45, 170,338.85 and 74,392.97

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Solution

The fourth proportional to 123,485.45, 170,338.85 and 74,392.97 is: 102,619.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,485.45 : 170,338.85 = 74,392.97 : x
  2. Step 2: Convert to fraction form
    123,485.45/170,338.85 = 74,392.97/x
  3. Step 3: Cross multiply
    123,485.45x = 170,338.85 × 74,392.97
  4. Step 4: Simplify right side
    123,485.45x = 12,672,012,013.20
  5. Step 5: Solve for x
    x = 12,672,012,013.20/123,485.45
  6. Step 6: Final answer
    x = 102,619.48

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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.