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Finding the Fourth Proportional to 1,205.55, 1,808.31 and 963.61

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Solution

The fourth proportional to 1,205.55, 1,808.31 and 963.61 is: 1,445.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.55 : 1,808.31 = 963.61 : x
  2. Step 2: Convert to fraction form
    1,205.55/1,808.31 = 963.61/x
  3. Step 3: Cross multiply
    1,205.55x = 1,808.31 × 963.61
  4. Step 4: Simplify right side
    1,205.55x = 1,742,504.69
  5. Step 5: Solve for x
    x = 1,742,504.69/1,205.55
  6. Step 6: Final answer
    x = 1,445.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.