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Finding the Fourth Proportional to 689.65, 1,034.47 and 305.17

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Solution

The fourth proportional to 689.65, 1,034.47 and 305.17 is: 457.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.65 : 1,034.47 = 305.17 : x
  2. Step 2: Convert to fraction form
    689.65/1,034.47 = 305.17/x
  3. Step 3: Cross multiply
    689.65x = 1,034.47 × 305.17
  4. Step 4: Simplify right side
    689.65x = 315,689.21
  5. Step 5: Solve for x
    x = 315,689.21/689.65
  6. Step 6: Final answer
    x = 457.75

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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.