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Finding the Fourth Proportional to 642,472.80, 886,611.60 and 356,011.44

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Solution

The fourth proportional to 642,472.80, 886,611.60 and 356,011.44 is: 491,295.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,472.80 : 886,611.60 = 356,011.44 : x
  2. Step 2: Convert to fraction form
    642,472.80/886,611.60 = 356,011.44/x
  3. Step 3: Cross multiply
    642,472.80x = 886,611.60 × 356,011.44
  4. Step 4: Simplify right side
    642,472.80x = 315,643,872,436.70
  5. Step 5: Solve for x
    x = 315,643,872,436.70/642,472.80
  6. Step 6: Final answer
    x = 491,295.31

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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.