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Finding the Fourth Proportional to 128,718.96, 177,624.84 and 75,012.72

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Solution

The fourth proportional to 128,718.96, 177,624.84 and 75,012.72 is: 103,513.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,718.96 : 177,624.84 = 75,012.72 : x
  2. Step 2: Convert to fraction form
    128,718.96/177,624.84 = 75,012.72/x
  3. Step 3: Cross multiply
    128,718.96x = 177,624.84 × 75,012.72
  4. Step 4: Simplify right side
    128,718.96x = 13,324,122,387.96
  5. Step 5: Solve for x
    x = 13,324,122,387.96/128,718.96
  6. Step 6: Final answer
    x = 103,513.28

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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.