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Finding the Fourth Proportional to 128,755.80, 177,683.38 and 71,399.16

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Solution

The fourth proportional to 128,755.80, 177,683.38 and 71,399.16 is: 98,531.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,755.80 : 177,683.38 = 71,399.16 : x
  2. Step 2: Convert to fraction form
    128,755.80/177,683.38 = 71,399.16/x
  3. Step 3: Cross multiply
    128,755.80x = 177,683.38 × 71,399.16
  4. Step 4: Simplify right side
    128,755.80x = 12,686,443,189.54
  5. Step 5: Solve for x
    x = 12,686,443,189.54/128,755.80
  6. Step 6: Final answer
    x = 98,531.05

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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.