Home / 128,708.73-177,421.16-90,360.70

Finding the Fourth Proportional to 128,708.73, 177,421.16 and 90,360.70

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Solution

The fourth proportional to 128,708.73, 177,421.16 and 90,360.70 is: 124,559.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,708.73 : 177,421.16 = 90,360.70 : x
  2. Step 2: Convert to fraction form
    128,708.73/177,421.16 = 90,360.70/x
  3. Step 3: Cross multiply
    128,708.73x = 177,421.16 × 90,360.70
  4. Step 4: Simplify right side
    128,708.73x = 16,031,900,212.41
  5. Step 5: Solve for x
    x = 16,031,900,212.41/128,708.73
  6. Step 6: Final answer
    x = 124,559.54

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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.