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Finding the Fourth Proportional to 1,145.87, 1,718.65 and 324.21

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Solution

The fourth proportional to 1,145.87, 1,718.65 and 324.21 is: 486.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.87 : 1,718.65 = 324.21 : x
  2. Step 2: Convert to fraction form
    1,145.87/1,718.65 = 324.21/x
  3. Step 3: Cross multiply
    1,145.87x = 1,718.65 × 324.21
  4. Step 4: Simplify right side
    1,145.87x = 557,201.90
  5. Step 5: Solve for x
    x = 557,201.90/1,145.87
  6. Step 6: Final answer
    x = 486.27

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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.