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Finding the Fourth Proportional to 643,098.80, 887,478.72 and 356,645.36

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Solution

The fourth proportional to 643,098.80, 887,478.72 and 356,645.36 is: 492,171.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,098.80 : 887,478.72 = 356,645.36 : x
  2. Step 2: Convert to fraction form
    643,098.80/887,478.72 = 356,645.36/x
  3. Step 3: Cross multiply
    643,098.80x = 887,478.72 × 356,645.36
  4. Step 4: Simplify right side
    643,098.80x = 316,515,167,586.74
  5. Step 5: Solve for x
    x = 316,515,167,586.74/643,098.80
  6. Step 6: Final answer
    x = 492,171.91

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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.