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Finding the Fourth Proportional to 100,818.32, 138,896.36 and 72,474.96

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Solution

The fourth proportional to 100,818.32, 138,896.36 and 72,474.96 is: 99,848.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,818.32 : 138,896.36 = 72,474.96 : x
  2. Step 2: Convert to fraction form
    100,818.32/138,896.36 = 72,474.96/x
  3. Step 3: Cross multiply
    100,818.32x = 138,896.36 × 72,474.96
  4. Step 4: Simplify right side
    100,818.32x = 10,066,508,135.15
  5. Step 5: Solve for x
    x = 10,066,508,135.15/100,818.32
  6. Step 6: Final answer
    x = 99,848.01

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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.