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Finding the Fourth Proportional to 667,876.40, 921,667.40 and 361,961.52

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Solution

The fourth proportional to 667,876.40, 921,667.40 and 361,961.52 is: 499,505.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,876.40 : 921,667.40 = 361,961.52 : x
  2. Step 2: Convert to fraction form
    667,876.40/921,667.40 = 361,961.52/x
  3. Step 3: Cross multiply
    667,876.40x = 921,667.40 × 361,961.52
  4. Step 4: Simplify right side
    667,876.40x = 333,608,133,038.45
  5. Step 5: Solve for x
    x = 333,608,133,038.45/667,876.40
  6. Step 6: Final answer
    x = 499,505.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.