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Finding the Fourth Proportional to 123,643.84, 170,668.74 and 72,655.68

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Solution

The fourth proportional to 123,643.84, 170,668.74 and 72,655.68 is: 100,288.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,643.84 : 170,668.74 = 72,655.68 : x
  2. Step 2: Convert to fraction form
    123,643.84/170,668.74 = 72,655.68/x
  3. Step 3: Cross multiply
    123,643.84x = 170,668.74 × 72,655.68
  4. Step 4: Simplify right side
    123,643.84x = 12,400,053,359.44
  5. Step 5: Solve for x
    x = 12,400,053,359.44/123,643.84
  6. Step 6: Final answer
    x = 100,288.48

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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.