Home / 128,278.79-177,025.01-71,690.17

Finding the Fourth Proportional to 128,278.79, 177,025.01 and 71,690.17

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Solution

The fourth proportional to 128,278.79, 177,025.01 and 71,690.17 is: 98,932.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,278.79 : 177,025.01 = 71,690.17 : x
  2. Step 2: Convert to fraction form
    128,278.79/177,025.01 = 71,690.17/x
  3. Step 3: Cross multiply
    128,278.79x = 177,025.01 × 71,690.17
  4. Step 4: Simplify right side
    128,278.79x = 12,690,952,260.14
  5. Step 5: Solve for x
    x = 12,690,952,260.14/128,278.79
  6. Step 6: Final answer
    x = 98,932.58

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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.