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Finding the Fourth Proportional to 1,149.20, 1,584.05 and 775.53

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Solution

The fourth proportional to 1,149.20, 1,584.05 and 775.53 is: 1,068.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,149.20 : 1,584.05 = 775.53 : x
  2. Step 2: Convert to fraction form
    1,149.20/1,584.05 = 775.53/x
  3. Step 3: Cross multiply
    1,149.20x = 1,584.05 × 775.53
  4. Step 4: Simplify right side
    1,149.20x = 1,228,474.42
  5. Step 5: Solve for x
    x = 1,228,474.42/1,149.20
  6. Step 6: Final answer
    x = 1,068.99

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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.