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Finding the Fourth Proportional to 643,040.30, 887,352.36 and 356,549.78

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Solution

The fourth proportional to 643,040.30, 887,352.36 and 356,549.78 is: 492,014.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,040.30 : 887,352.36 = 356,549.78 : x
  2. Step 2: Convert to fraction form
    643,040.30/887,352.36 = 356,549.78/x
  3. Step 3: Cross multiply
    643,040.30x = 887,352.36 × 356,549.78
  4. Step 4: Simplify right side
    643,040.30x = 316,385,288,740.48
  5. Step 5: Solve for x
    x = 316,385,288,740.48/643,040.30
  6. Step 6: Final answer
    x = 492,014.71

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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.