Home / 128,438.90-177,241.31-71,080.65

Finding the Fourth Proportional to 128,438.90, 177,241.31 and 71,080.65

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Solution

The fourth proportional to 128,438.90, 177,241.31 and 71,080.65 is: 98,088.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,438.90 : 177,241.31 = 71,080.65 : x
  2. Step 2: Convert to fraction form
    128,438.90/177,241.31 = 71,080.65/x
  3. Step 3: Cross multiply
    128,438.90x = 177,241.31 × 71,080.65
  4. Step 4: Simplify right side
    128,438.90x = 12,598,427,521.65
  5. Step 5: Solve for x
    x = 12,598,427,521.65/128,438.90
  6. Step 6: Final answer
    x = 98,088.88

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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.