Home / 128,291.50-177,042.54-85,951.18

Finding the Fourth Proportional to 128,291.50, 177,042.54 and 85,951.18

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Solution

The fourth proportional to 128,291.50, 177,042.54 and 85,951.18 is: 118,612.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,291.50 : 177,042.54 = 85,951.18 : x
  2. Step 2: Convert to fraction form
    128,291.50/177,042.54 = 85,951.18/x
  3. Step 3: Cross multiply
    128,291.50x = 177,042.54 × 85,951.18
  4. Step 4: Simplify right side
    128,291.50x = 15,217,015,223.20
  5. Step 5: Solve for x
    x = 15,217,015,223.20/128,291.50
  6. Step 6: Final answer
    x = 118,612.81

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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.