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Finding the Fourth Proportional to 1,099.13, 1,518.68 and 862.88

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Solution

The fourth proportional to 1,099.13, 1,518.68 and 862.88 is: 1,192.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.13 : 1,518.68 = 862.88 : x
  2. Step 2: Convert to fraction form
    1,099.13/1,518.68 = 862.88/x
  3. Step 3: Cross multiply
    1,099.13x = 1,518.68 × 862.88
  4. Step 4: Simplify right side
    1,099.13x = 1,310,433.16
  5. Step 5: Solve for x
    x = 1,310,433.16/1,099.13
  6. Step 6: Final answer
    x = 1,192.25

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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.