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Finding the Fourth Proportional to 100,619.34, 138,806.84 and 72,341.43

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Solution

The fourth proportional to 100,619.34, 138,806.84 and 72,341.43 is: 99,796.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,619.34 : 138,806.84 = 72,341.43 : x
  2. Step 2: Convert to fraction form
    100,619.34/138,806.84 = 72,341.43/x
  3. Step 3: Cross multiply
    100,619.34x = 138,806.84 × 72,341.43
  4. Step 4: Simplify right side
    100,619.34x = 10,041,484,937.67
  5. Step 5: Solve for x
    x = 10,041,484,937.67/100,619.34
  6. Step 6: Final answer
    x = 99,796.77

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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.