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Finding the Fourth Proportional to 280,679.16, 421,123.50 and 168,439.89

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Solution

The fourth proportional to 280,679.16, 421,123.50 and 168,439.89 is: 252,722.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,679.16 : 421,123.50 = 168,439.89 : x
  2. Step 2: Convert to fraction form
    280,679.16/421,123.50 = 168,439.89/x
  3. Step 3: Cross multiply
    280,679.16x = 421,123.50 × 168,439.89
  4. Step 4: Simplify right side
    280,679.16x = 70,933,996,016.42
  5. Step 5: Solve for x
    x = 70,933,996,016.42/280,679.16
  6. Step 6: Final answer
    x = 252,722.70

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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.