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Finding the Fourth Proportional to 1,213.30, 1,674.34 and 689.35

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Solution

The fourth proportional to 1,213.30, 1,674.34 and 689.35 is: 951.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.30 : 1,674.34 = 689.35 : x
  2. Step 2: Convert to fraction form
    1,213.30/1,674.34 = 689.35/x
  3. Step 3: Cross multiply
    1,213.30x = 1,674.34 × 689.35
  4. Step 4: Simplify right side
    1,213.30x = 1,154,206.28
  5. Step 5: Solve for x
    x = 1,154,206.28/1,213.30
  6. Step 6: Final answer
    x = 951.30

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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.