Home / 100,681.89-138,937.45-55,359.55

Finding the Fourth Proportional to 100,681.89, 138,937.45 and 55,359.55

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Solution

The fourth proportional to 100,681.89, 138,937.45 and 55,359.55 is: 76,394.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,681.89 : 138,937.45 = 55,359.55 : x
  2. Step 2: Convert to fraction form
    100,681.89/138,937.45 = 55,359.55/x
  3. Step 3: Cross multiply
    100,681.89x = 138,937.45 × 55,359.55
  4. Step 4: Simplify right side
    100,681.89x = 7,691,514,919.09
  5. Step 5: Solve for x
    x = 7,691,514,919.09/100,681.89
  6. Step 6: Final answer
    x = 76,394.23

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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.