Home / 128,759.42-177,688.39-71,402.78

Finding the Fourth Proportional to 128,759.42, 177,688.39 and 71,402.78

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Solution

The fourth proportional to 128,759.42, 177,688.39 and 71,402.78 is: 98,536.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,759.42 : 177,688.39 = 71,402.78 : x
  2. Step 2: Convert to fraction form
    128,759.42/177,688.39 = 71,402.78/x
  3. Step 3: Cross multiply
    128,759.42x = 177,688.39 × 71,402.78
  4. Step 4: Simplify right side
    128,759.42x = 12,687,443,952.78
  5. Step 5: Solve for x
    x = 12,687,443,952.78/128,759.42
  6. Step 6: Final answer
    x = 98,536.05

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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.