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Finding the Fourth Proportional to 100,620.66, 138,710.24 and 70,311.88

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Solution

The fourth proportional to 100,620.66, 138,710.24 and 70,311.88 is: 96,928.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,620.66 : 138,710.24 = 70,311.88 : x
  2. Step 2: Convert to fraction form
    100,620.66/138,710.24 = 70,311.88/x
  3. Step 3: Cross multiply
    100,620.66x = 138,710.24 × 70,311.88
  4. Step 4: Simplify right side
    100,620.66x = 9,752,977,835.15
  5. Step 5: Solve for x
    x = 9,752,977,835.15/100,620.66
  6. Step 6: Final answer
    x = 96,928.18

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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.