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Finding the Fourth Proportional to 128,079.92, 191,964.24 and 90,650.88

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Solution

The fourth proportional to 128,079.92, 191,964.24 and 90,650.88 is: 135,866.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,079.92 : 191,964.24 = 90,650.88 : x
  2. Step 2: Convert to fraction form
    128,079.92/191,964.24 = 90,650.88/x
  3. Step 3: Cross multiply
    128,079.92x = 191,964.24 × 90,650.88
  4. Step 4: Simplify right side
    128,079.92x = 17,401,727,284.53
  5. Step 5: Solve for x
    x = 17,401,727,284.53/128,079.92
  6. Step 6: Final answer
    x = 135,866.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.