Home / 128,578.38-177,438.77-71,989.75

Finding the Fourth Proportional to 128,578.38, 177,438.77 and 71,989.75

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Solution

The fourth proportional to 128,578.38, 177,438.77 and 71,989.75 is: 99,346.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,578.38 : 177,438.77 = 71,989.75 : x
  2. Step 2: Convert to fraction form
    128,578.38/177,438.77 = 71,989.75/x
  3. Step 3: Cross multiply
    128,578.38x = 177,438.77 × 71,989.75
  4. Step 4: Simplify right side
    128,578.38x = 12,773,772,692.61
  5. Step 5: Solve for x
    x = 12,773,772,692.61/128,578.38
  6. Step 6: Final answer
    x = 99,346.19

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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.