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Finding the Fourth Proportional to 1,213.58, 1,674.60 and 689.50

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Solution

The fourth proportional to 1,213.58, 1,674.60 and 689.50 is: 951.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.58 : 1,674.60 = 689.50 : x
  2. Step 2: Convert to fraction form
    1,213.58/1,674.60 = 689.50/x
  3. Step 3: Cross multiply
    1,213.58x = 1,674.60 × 689.50
  4. Step 4: Simplify right side
    1,213.58x = 1,154,636.70
  5. Step 5: Solve for x
    x = 1,154,636.70/1,213.58
  6. Step 6: Final answer
    x = 951.43

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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.