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Finding the Fourth Proportional to 1,213.21, 1,674.17 and 689.23

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Solution

The fourth proportional to 1,213.21, 1,674.17 and 689.23 is: 951.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.21 : 1,674.17 = 689.23 : x
  2. Step 2: Convert to fraction form
    1,213.21/1,674.17 = 689.23/x
  3. Step 3: Cross multiply
    1,213.21x = 1,674.17 × 689.23
  4. Step 4: Simplify right side
    1,213.21x = 1,153,883.14
  5. Step 5: Solve for x
    x = 1,153,883.14/1,213.21
  6. Step 6: Final answer
    x = 951.10

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1.5x scale

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.