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Finding the Fourth Proportional to 280,667.88, 420,902.70 and 80,934.36

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Solution

The fourth proportional to 280,667.88, 420,902.70 and 80,934.36 is: 121,372.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,667.88 : 420,902.70 = 80,934.36 : x
  2. Step 2: Convert to fraction form
    280,667.88/420,902.70 = 80,934.36/x
  3. Step 3: Cross multiply
    280,667.88x = 420,902.70 × 80,934.36
  4. Step 4: Simplify right side
    280,667.88x = 34,065,490,646.77
  5. Step 5: Solve for x
    x = 34,065,490,646.77/280,667.88
  6. Step 6: Final answer
    x = 121,372.96

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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.