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Finding the Fourth Proportional to 1,213.31, 1,674.32 and 689.28

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Solution

The fourth proportional to 1,213.31, 1,674.32 and 689.28 is: 951.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.31 : 1,674.32 = 689.28 : x
  2. Step 2: Convert to fraction form
    1,213.31/1,674.32 = 689.28/x
  3. Step 3: Cross multiply
    1,213.31x = 1,674.32 × 689.28
  4. Step 4: Simplify right side
    1,213.31x = 1,154,071.84
  5. Step 5: Solve for x
    x = 1,154,071.84/1,213.31
  6. Step 6: Final answer
    x = 951.18

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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.