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Finding the Fourth Proportional to 802.87, 1,103.71 and 690.43

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Solution

The fourth proportional to 802.87, 1,103.71 and 690.43 is: 949.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.87 : 1,103.71 = 690.43 : x
  2. Step 2: Convert to fraction form
    802.87/1,103.71 = 690.43/x
  3. Step 3: Cross multiply
    802.87x = 1,103.71 × 690.43
  4. Step 4: Simplify right side
    802.87x = 762,027.25
  5. Step 5: Solve for x
    x = 762,027.25/802.87
  6. Step 6: Final answer
    x = 949.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.