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Finding the Fourth Proportional to 100,710.44, 138,987.20 and 66,660.28

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Solution

The fourth proportional to 100,710.44, 138,987.20 and 66,660.28 is: 91,995.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,710.44 : 138,987.20 = 66,660.28 : x
  2. Step 2: Convert to fraction form
    100,710.44/138,987.20 = 66,660.28/x
  3. Step 3: Cross multiply
    100,710.44x = 138,987.20 × 66,660.28
  4. Step 4: Simplify right side
    100,710.44x = 9,264,925,668.42
  5. Step 5: Solve for x
    x = 9,264,925,668.42/100,710.44
  6. Step 6: Final answer
    x = 91,995.68

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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.