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Finding the Fourth Proportional to 802.78, 1,107.97 and 638.24

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Solution

The fourth proportional to 802.78, 1,107.97 and 638.24 is: 880.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.78 : 1,107.97 = 638.24 : x
  2. Step 2: Convert to fraction form
    802.78/1,107.97 = 638.24/x
  3. Step 3: Cross multiply
    802.78x = 1,107.97 × 638.24
  4. Step 4: Simplify right side
    802.78x = 707,150.77
  5. Step 5: Solve for x
    x = 707,150.77/802.78
  6. Step 6: Final answer
    x = 880.88

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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.