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Finding the Fourth Proportional to 128,378.16, 177,163.20 and 71,792.64

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Solution

The fourth proportional to 128,378.16, 177,163.20 and 71,792.64 is: 99,074.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,378.16 : 177,163.20 = 71,792.64 : x
  2. Step 2: Convert to fraction form
    128,378.16/177,163.20 = 71,792.64/x
  3. Step 3: Cross multiply
    128,378.16x = 177,163.20 × 71,792.64
  4. Step 4: Simplify right side
    128,378.16x = 12,719,013,838.85
  5. Step 5: Solve for x
    x = 12,719,013,838.85/128,378.16
  6. Step 6: Final answer
    x = 99,074.59

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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.