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Finding the Fourth Proportional to 129,678.66, 178,970.76 and 75,242.79

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Solution

The fourth proportional to 129,678.66, 178,970.76 and 75,242.79 is: 103,843.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,678.66 : 178,970.76 = 75,242.79 : x
  2. Step 2: Convert to fraction form
    129,678.66/178,970.76 = 75,242.79/x
  3. Step 3: Cross multiply
    129,678.66x = 178,970.76 × 75,242.79
  4. Step 4: Simplify right side
    129,678.66x = 13,466,259,310.82
  5. Step 5: Solve for x
    x = 13,466,259,310.82/129,678.66
  6. Step 6: Final answer
    x = 103,843.29

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1.5x scale

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.