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Finding the Fourth Proportional to 112,170.40, 168,061.20 and 72,707.20

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Solution

The fourth proportional to 112,170.40, 168,061.20 and 72,707.20 is: 108,934.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,170.40 : 168,061.20 = 72,707.20 : x
  2. Step 2: Convert to fraction form
    112,170.40/168,061.20 = 72,707.20/x
  3. Step 3: Cross multiply
    112,170.40x = 168,061.20 × 72,707.20
  4. Step 4: Simplify right side
    112,170.40x = 12,219,259,280.64
  5. Step 5: Solve for x
    x = 12,219,259,280.64/112,170.40
  6. Step 6: Final answer
    x = 108,934.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.