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Finding the Fourth Proportional to 129,036.80, 178,065.28 and 75,324.80

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Solution

The fourth proportional to 129,036.80, 178,065.28 and 75,324.80 is: 103,945.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,036.80 : 178,065.28 = 75,324.80 : x
  2. Step 2: Convert to fraction form
    129,036.80/178,065.28 = 75,324.80/x
  3. Step 3: Cross multiply
    129,036.80x = 178,065.28 × 75,324.80
  4. Step 4: Simplify right side
    129,036.80x = 13,412,731,602.94
  5. Step 5: Solve for x
    x = 13,412,731,602.94/129,036.80
  6. Step 6: Final answer
    x = 103,945.01

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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.