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Finding the Fourth Proportional to 900.55, 1,235 and 863.13

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Solution

The fourth proportional to 900.55, 1,235 and 863.13 is: 1,183.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.55 : 1,235 = 863.13 : x
  2. Step 2: Convert to fraction form
    900.55/1,235 = 863.13/x
  3. Step 3: Cross multiply
    900.55x = 1,235 × 863.13
  4. Step 4: Simplify right side
    900.55x = 1,065,965.55
  5. Step 5: Solve for x
    x = 1,065,965.55/900.55
  6. Step 6: Final answer
    x = 1,183.68

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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.