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Finding the Fourth Proportional to 999.60, 1,378.68 and 868.08

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Solution

The fourth proportional to 999.60, 1,378.68 and 868.08 is: 1,197.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.60 : 1,378.68 = 868.08 : x
  2. Step 2: Convert to fraction form
    999.60/1,378.68 = 868.08/x
  3. Step 3: Cross multiply
    999.60x = 1,378.68 × 868.08
  4. Step 4: Simplify right side
    999.60x = 1,196,804.53
  5. Step 5: Solve for x
    x = 1,196,804.53/999.60
  6. Step 6: Final answer
    x = 1,197.28

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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.