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Finding the Fourth Proportional to 100,729.76, 139,017.92 and 63,016.16

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Solution

The fourth proportional to 100,729.76, 139,017.92 and 63,016.16 is: 86,969.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,729.76 : 139,017.92 = 63,016.16 : x
  2. Step 2: Convert to fraction form
    100,729.76/139,017.92 = 63,016.16/x
  3. Step 3: Cross multiply
    100,729.76x = 139,017.92 × 63,016.16
  4. Step 4: Simplify right side
    100,729.76x = 8,760,375,489.59
  5. Step 5: Solve for x
    x = 8,760,375,489.59/100,729.76
  6. Step 6: Final answer
    x = 86,969.09

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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.