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Finding the Fourth Proportional to 1,039.30, 1,433.29 and 689.38

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Solution

The fourth proportional to 1,039.30, 1,433.29 and 689.38 is: 950.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.30 : 1,433.29 = 689.38 : x
  2. Step 2: Convert to fraction form
    1,039.30/1,433.29 = 689.38/x
  3. Step 3: Cross multiply
    1,039.30x = 1,433.29 × 689.38
  4. Step 4: Simplify right side
    1,039.30x = 988,081.46
  5. Step 5: Solve for x
    x = 988,081.46/1,039.30
  6. Step 6: Final answer
    x = 950.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.