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Finding the Fourth Proportional to 128,847.28, 178,053.28 and 96,960.64

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Solution

The fourth proportional to 128,847.28, 178,053.28 and 96,960.64 is: 133,989.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,847.28 : 178,053.28 = 96,960.64 : x
  2. Step 2: Convert to fraction form
    128,847.28/178,053.28 = 96,960.64/x
  3. Step 3: Cross multiply
    128,847.28x = 178,053.28 × 96,960.64
  4. Step 4: Simplify right side
    128,847.28x = 17,264,159,982.90
  5. Step 5: Solve for x
    x = 17,264,159,982.90/128,847.28
  6. Step 6: Final answer
    x = 133,989.32

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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.