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Finding the Fourth Proportional to 128,082.70, 191,905.35 and 81,280.90

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Solution

The fourth proportional to 128,082.70, 191,905.35 and 81,280.90 is: 121,782.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,082.70 : 191,905.35 = 81,280.90 : x
  2. Step 2: Convert to fraction form
    128,082.70/191,905.35 = 81,280.90/x
  3. Step 3: Cross multiply
    128,082.70x = 191,905.35 × 81,280.90
  4. Step 4: Simplify right side
    128,082.70x = 15,598,239,562.82
  5. Step 5: Solve for x
    x = 15,598,239,562.82/128,082.70
  6. Step 6: Final answer
    x = 121,782.56

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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.