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Finding the Fourth Proportional to 1,145.32, 1,718.12 and 323.56

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Solution

The fourth proportional to 1,145.32, 1,718.12 and 323.56 is: 485.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.32 : 1,718.12 = 323.56 : x
  2. Step 2: Convert to fraction form
    1,145.32/1,718.12 = 323.56/x
  3. Step 3: Cross multiply
    1,145.32x = 1,718.12 × 323.56
  4. Step 4: Simplify right side
    1,145.32x = 555,914.91
  5. Step 5: Solve for x
    x = 555,914.91/1,145.32
  6. Step 6: Final answer
    x = 485.38

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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.