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Finding the Fourth Proportional to 100,620.34, 138,808.21 and 72,342.43

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Solution

The fourth proportional to 100,620.34, 138,808.21 and 72,342.43 is: 99,798.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,620.34 : 138,808.21 = 72,342.43 : x
  2. Step 2: Convert to fraction form
    100,620.34/138,808.21 = 72,342.43/x
  3. Step 3: Cross multiply
    100,620.34x = 138,808.21 × 72,342.43
  4. Step 4: Simplify right side
    100,620.34x = 10,041,723,215.35
  5. Step 5: Solve for x
    x = 10,041,723,215.35/100,620.34
  6. Step 6: Final answer
    x = 99,798.14

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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.