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Finding the Fourth Proportional to 1,043.65, 1,439.22 and 639.76

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Solution

The fourth proportional to 1,043.65, 1,439.22 and 639.76 is: 882.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.65 : 1,439.22 = 639.76 : x
  2. Step 2: Convert to fraction form
    1,043.65/1,439.22 = 639.76/x
  3. Step 3: Cross multiply
    1,043.65x = 1,439.22 × 639.76
  4. Step 4: Simplify right side
    1,043.65x = 920,755.39
  5. Step 5: Solve for x
    x = 920,755.39/1,043.65
  6. Step 6: Final answer
    x = 882.25

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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.