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Finding the Fourth Proportional to 689.66, 1,035.30 and 305.18

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Solution

The fourth proportional to 689.66, 1,035.30 and 305.18 is: 458.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.66 : 1,035.30 = 305.18 : x
  2. Step 2: Convert to fraction form
    689.66/1,035.30 = 305.18/x
  3. Step 3: Cross multiply
    689.66x = 1,035.30 × 305.18
  4. Step 4: Simplify right side
    689.66x = 315,952.85
  5. Step 5: Solve for x
    x = 315,952.85/689.66
  6. Step 6: Final answer
    x = 458.13

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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.