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Finding the Fourth Proportional to 123,728.94, 170,749.02 and 67,140.18

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Solution

The fourth proportional to 123,728.94, 170,749.02 and 67,140.18 is: 92,655.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,728.94 : 170,749.02 = 67,140.18 : x
  2. Step 2: Convert to fraction form
    123,728.94/170,749.02 = 67,140.18/x
  3. Step 3: Cross multiply
    123,728.94x = 170,749.02 × 67,140.18
  4. Step 4: Simplify right side
    123,728.94x = 11,464,119,937.62
  5. Step 5: Solve for x
    x = 11,464,119,937.62/123,728.94
  6. Step 6: Final answer
    x = 92,655.12

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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.