Home / 128,587.18-177,788.77-112,625.72

Finding the Fourth Proportional to 128,587.18, 177,788.77 and 112,625.72

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Solution

The fourth proportional to 128,587.18, 177,788.77 and 112,625.72 is: 155,719.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,587.18 : 177,788.77 = 112,625.72 : x
  2. Step 2: Convert to fraction form
    128,587.18/177,788.77 = 112,625.72/x
  3. Step 3: Cross multiply
    128,587.18x = 177,788.77 × 112,625.72
  4. Step 4: Simplify right side
    128,587.18x = 20,023,588,725.43
  5. Step 5: Solve for x
    x = 20,023,588,725.43/128,587.18
  6. Step 6: Final answer
    x = 155,719.95

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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.