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Finding the Fourth Proportional to 643,318.65, 887,886.20 and 356,931

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Solution

The fourth proportional to 643,318.65, 887,886.20 and 356,931 is: 492,623.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,318.65 : 887,886.20 = 356,931 : x
  2. Step 2: Convert to fraction form
    643,318.65/887,886.20 = 356,931/x
  3. Step 3: Cross multiply
    643,318.65x = 887,886.20 × 356,931
  4. Step 4: Simplify right side
    643,318.65x = 316,914,107,467.55
  5. Step 5: Solve for x
    x = 316,914,107,467.55/643,318.65
  6. Step 6: Final answer
    x = 492,623.85

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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.