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Finding the Fourth Proportional to 1,221.14, 1,685.34 and 690.14

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Solution

The fourth proportional to 1,221.14, 1,685.34 and 690.14 is: 952.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.14 : 1,685.34 = 690.14 : x
  2. Step 2: Convert to fraction form
    1,221.14/1,685.34 = 690.14/x
  3. Step 3: Cross multiply
    1,221.14x = 1,685.34 × 690.14
  4. Step 4: Simplify right side
    1,221.14x = 1,163,112.12
  5. Step 5: Solve for x
    x = 1,163,112.12/1,221.14
  6. Step 6: Final answer
    x = 952.48

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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.