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Finding the Fourth Proportional to 100,505.88, 138,700.76 and 55,186.79

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Solution

The fourth proportional to 100,505.88, 138,700.76 and 55,186.79 is: 76,159.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,505.88 : 138,700.76 = 55,186.79 : x
  2. Step 2: Convert to fraction form
    100,505.88/138,700.76 = 55,186.79/x
  3. Step 3: Cross multiply
    100,505.88x = 138,700.76 × 55,186.79
  4. Step 4: Simplify right side
    100,505.88x = 7,654,448,745.52
  5. Step 5: Solve for x
    x = 7,654,448,745.52/100,505.88
  6. Step 6: Final answer
    x = 76,159.21

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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.