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Finding the Fourth Proportional to 123,478.68, 170,400.42 and 66,890.28

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Solution

The fourth proportional to 123,478.68, 170,400.42 and 66,890.28 is: 92,308.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,478.68 : 170,400.42 = 66,890.28 : x
  2. Step 2: Convert to fraction form
    123,478.68/170,400.42 = 66,890.28/x
  3. Step 3: Cross multiply
    123,478.68x = 170,400.42 × 66,890.28
  4. Step 4: Simplify right side
    123,478.68x = 11,398,131,805.92
  5. Step 5: Solve for x
    x = 11,398,131,805.92/123,478.68
  6. Step 6: Final answer
    x = 92,308.50

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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.