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Finding the Fourth Proportional to 139,693.12, 192,781.44 and 79,264

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Solution

The fourth proportional to 139,693.12, 192,781.44 and 79,264 is: 109,387.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,693.12 : 192,781.44 = 79,264 : x
  2. Step 2: Convert to fraction form
    139,693.12/192,781.44 = 79,264/x
  3. Step 3: Cross multiply
    139,693.12x = 192,781.44 × 79,264
  4. Step 4: Simplify right side
    139,693.12x = 15,280,628,060.16
  5. Step 5: Solve for x
    x = 15,280,628,060.16/139,693.12
  6. Step 6: Final answer
    x = 109,387.12

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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.