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Finding the Fourth Proportional to 100,679.47, 138,934.71 and 55,357.40

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Solution

The fourth proportional to 100,679.47, 138,934.71 and 55,357.40 is: 76,391.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,679.47 : 138,934.71 = 55,357.40 : x
  2. Step 2: Convert to fraction form
    100,679.47/138,934.71 = 55,357.40/x
  3. Step 3: Cross multiply
    100,679.47x = 138,934.71 × 55,357.40
  4. Step 4: Simplify right side
    100,679.47x = 7,691,064,315.35
  5. Step 5: Solve for x
    x = 7,691,064,315.35/100,679.47
  6. Step 6: Final answer
    x = 76,391.59

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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.