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Finding the Fourth Proportional to 128,880.92, 177,750.24 and 90,766.92

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Solution

The fourth proportional to 128,880.92, 177,750.24 and 90,766.92 is: 125,184.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,880.92 : 177,750.24 = 90,766.92 : x
  2. Step 2: Convert to fraction form
    128,880.92/177,750.24 = 90,766.92/x
  3. Step 3: Cross multiply
    128,880.92x = 177,750.24 × 90,766.92
  4. Step 4: Simplify right side
    128,880.92x = 16,133,841,814.06
  5. Step 5: Solve for x
    x = 16,133,841,814.06/128,880.92
  6. Step 6: Final answer
    x = 125,184.10

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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.