Home / 128,988.35-177,997.93-71,631.30

Finding the Fourth Proportional to 128,988.35, 177,997.93 and 71,631.30

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Solution

The fourth proportional to 128,988.35, 177,997.93 and 71,631.30 is: 98,847.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,988.35 : 177,997.93 = 71,631.30 : x
  2. Step 2: Convert to fraction form
    128,988.35/177,997.93 = 71,631.30/x
  3. Step 3: Cross multiply
    128,988.35x = 177,997.93 × 71,631.30
  4. Step 4: Simplify right side
    128,988.35x = 12,750,223,123.21
  5. Step 5: Solve for x
    x = 12,750,223,123.21/128,988.35
  6. Step 6: Final answer
    x = 98,847.87

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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.