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Finding the Fourth Proportional to 1,145.39, 1,718.06 and 323.65

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Solution

The fourth proportional to 1,145.39, 1,718.06 and 323.65 is: 485.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.39 : 1,718.06 = 323.65 : x
  2. Step 2: Convert to fraction form
    1,145.39/1,718.06 = 323.65/x
  3. Step 3: Cross multiply
    1,145.39x = 1,718.06 × 323.65
  4. Step 4: Simplify right side
    1,145.39x = 556,053.61
  5. Step 5: Solve for x
    x = 556,053.61/1,145.39
  6. Step 6: Final answer
    x = 485.47

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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.