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Finding the Fourth Proportional to 128,329.92, 177,090.84 and 71,741.16

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Solution

The fourth proportional to 128,329.92, 177,090.84 and 71,741.16 is: 99,000.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,329.92 : 177,090.84 = 71,741.16 : x
  2. Step 2: Convert to fraction form
    128,329.92/177,090.84 = 71,741.16/x
  3. Step 3: Cross multiply
    128,329.92x = 177,090.84 × 71,741.16
  4. Step 4: Simplify right side
    128,329.92x = 12,704,702,286.97
  5. Step 5: Solve for x
    x = 12,704,702,286.97/128,329.92
  6. Step 6: Final answer
    x = 99,000.31

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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.