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Finding the Fourth Proportional to 1,221.24, 1,685.22 and 690.09

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Solution

The fourth proportional to 1,221.24, 1,685.22 and 690.09 is: 952.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.24 : 1,685.22 = 690.09 : x
  2. Step 2: Convert to fraction form
    1,221.24/1,685.22 = 690.09/x
  3. Step 3: Cross multiply
    1,221.24x = 1,685.22 × 690.09
  4. Step 4: Simplify right side
    1,221.24x = 1,162,953.47
  5. Step 5: Solve for x
    x = 1,162,953.47/1,221.24
  6. Step 6: Final answer
    x = 952.27

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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.