Home / 128,415.81-177,204.18-71,816.25

Finding the Fourth Proportional to 128,415.81, 177,204.18 and 71,816.25

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Solution

The fourth proportional to 128,415.81, 177,204.18 and 71,816.25 is: 99,101.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,415.81 : 177,204.18 = 71,816.25 : x
  2. Step 2: Convert to fraction form
    128,415.81/177,204.18 = 71,816.25/x
  3. Step 3: Cross multiply
    128,415.81x = 177,204.18 × 71,816.25
  4. Step 4: Simplify right side
    128,415.81x = 12,726,139,691.93
  5. Step 5: Solve for x
    x = 12,726,139,691.93/128,415.81
  6. Step 6: Final answer
    x = 99,101.04

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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.