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Finding the Fourth Proportional to 100,697.40, 138,991.68 and 62,468.64

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Solution

The fourth proportional to 100,697.40, 138,991.68 and 62,468.64 is: 86,224.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,697.40 : 138,991.68 = 62,468.64 : x
  2. Step 2: Convert to fraction form
    100,697.40/138,991.68 = 62,468.64/x
  3. Step 3: Cross multiply
    100,697.40x = 138,991.68 × 62,468.64
  4. Step 4: Simplify right side
    100,697.40x = 8,682,621,220.92
  5. Step 5: Solve for x
    x = 8,682,621,220.92/100,697.40
  6. Step 6: Final answer
    x = 86,224.88

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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.