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Finding the Fourth Proportional to 128,838.87, 177,797.90 and 71,478.18

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Solution

The fourth proportional to 128,838.87, 177,797.90 and 71,478.18 is: 98,640.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,838.87 : 177,797.90 = 71,478.18 : x
  2. Step 2: Convert to fraction form
    128,838.87/177,797.90 = 71,478.18/x
  3. Step 3: Cross multiply
    128,838.87x = 177,797.90 × 71,478.18
  4. Step 4: Simplify right side
    128,838.87x = 12,708,670,478.52
  5. Step 5: Solve for x
    x = 12,708,670,478.52/128,838.87
  6. Step 6: Final answer
    x = 98,640.03

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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.