Home / 1,221.18-1,685.10-749.15

Finding the Fourth Proportional to 1,221.18, 1,685.10 and 749.15

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Solution

The fourth proportional to 1,221.18, 1,685.10 and 749.15 is: 1,033.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.18 : 1,685.10 = 749.15 : x
  2. Step 2: Convert to fraction form
    1,221.18/1,685.10 = 749.15/x
  3. Step 3: Cross multiply
    1,221.18x = 1,685.10 × 749.15
  4. Step 4: Simplify right side
    1,221.18x = 1,262,393.37
  5. Step 5: Solve for x
    x = 1,262,393.37/1,221.18
  6. Step 6: Final answer
    x = 1,033.75

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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.