Home / 128,420.76-177,228.54-71,835.96

Finding the Fourth Proportional to 128,420.76, 177,228.54 and 71,835.96

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Solution

The fourth proportional to 128,420.76, 177,228.54 and 71,835.96 is: 99,138.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,420.76 : 177,228.54 = 71,835.96 : x
  2. Step 2: Convert to fraction form
    128,420.76/177,228.54 = 71,835.96/x
  3. Step 3: Cross multiply
    128,420.76x = 177,228.54 × 71,835.96
  4. Step 4: Simplify right side
    128,420.76x = 12,731,382,310.30
  5. Step 5: Solve for x
    x = 12,731,382,310.30/128,420.76
  6. Step 6: Final answer
    x = 99,138.04

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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.