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Finding the Fourth Proportional to 100,652.16, 138,920.12 and 76,736.12

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Solution

The fourth proportional to 100,652.16, 138,920.12 and 76,736.12 is: 105,911.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,652.16 : 138,920.12 = 76,736.12 : x
  2. Step 2: Convert to fraction form
    100,652.16/138,920.12 = 76,736.12/x
  3. Step 3: Cross multiply
    100,652.16x = 138,920.12 × 76,736.12
  4. Step 4: Simplify right side
    100,652.16x = 10,660,190,998.73
  5. Step 5: Solve for x
    x = 10,660,190,998.73/100,652.16
  6. Step 6: Final answer
    x = 105,911.20

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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.