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Finding the Fourth Proportional to 643,227.66, 887,708.67 and 356,840

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Solution

The fourth proportional to 643,227.66, 887,708.67 and 356,840 is: 492,469.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,227.66 : 887,708.67 = 356,840 : x
  2. Step 2: Convert to fraction form
    643,227.66/887,708.67 = 356,840/x
  3. Step 3: Cross multiply
    643,227.66x = 887,708.67 × 356,840
  4. Step 4: Simplify right side
    643,227.66x = 316,769,961,802.80
  5. Step 5: Solve for x
    x = 316,769,961,802.80/643,227.66
  6. Step 6: Final answer
    x = 492,469.43

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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.