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Finding the Fourth Proportional to 1,145.85, 1,718.82 and 324.20

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Solution

The fourth proportional to 1,145.85, 1,718.82 and 324.20 is: 486.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.85 : 1,718.82 = 324.20 : x
  2. Step 2: Convert to fraction form
    1,145.85/1,718.82 = 324.20/x
  3. Step 3: Cross multiply
    1,145.85x = 1,718.82 × 324.20
  4. Step 4: Simplify right side
    1,145.85x = 557,245.74
  5. Step 5: Solve for x
    x = 557,245.74/1,145.85
  6. Step 6: Final answer
    x = 486.32

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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.