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Finding the Fourth Proportional to 128,958.20, 193,437.30 and 84,721.40

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Solution

The fourth proportional to 128,958.20, 193,437.30 and 84,721.40 is: 127,082.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,958.20 : 193,437.30 = 84,721.40 : x
  2. Step 2: Convert to fraction form
    128,958.20/193,437.30 = 84,721.40/x
  3. Step 3: Cross multiply
    128,958.20x = 193,437.30 × 84,721.40
  4. Step 4: Simplify right side
    128,958.20x = 16,388,278,868.22
  5. Step 5: Solve for x
    x = 16,388,278,868.22/128,958.20
  6. Step 6: Final answer
    x = 127,082.10

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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.