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Finding the Fourth Proportional to 1,213.98, 1,675.26 and 690.18

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Solution

The fourth proportional to 1,213.98, 1,675.26 and 690.18 is: 952.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.98 : 1,675.26 = 690.18 : x
  2. Step 2: Convert to fraction form
    1,213.98/1,675.26 = 690.18/x
  3. Step 3: Cross multiply
    1,213.98x = 1,675.26 × 690.18
  4. Step 4: Simplify right side
    1,213.98x = 1,156,230.95
  5. Step 5: Solve for x
    x = 1,156,230.95/1,213.98
  6. Step 6: Final answer
    x = 952.43

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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.