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Finding the Fourth Proportional to 100,679.90, 138,922.71 and 58,242.38

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Solution

The fourth proportional to 100,679.90, 138,922.71 and 58,242.38 is: 80,365.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,679.90 : 138,922.71 = 58,242.38 : x
  2. Step 2: Convert to fraction form
    100,679.90/138,922.71 = 58,242.38/x
  3. Step 3: Cross multiply
    100,679.90x = 138,922.71 × 58,242.38
  4. Step 4: Simplify right side
    100,679.90x = 8,091,189,266.45
  5. Step 5: Solve for x
    x = 8,091,189,266.45/100,679.90
  6. Step 6: Final answer
    x = 80,365.49

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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.