Home / 1,221.38-1,685.51-1,177.23

Finding the Fourth Proportional to 1,221.38, 1,685.51 and 1,177.23

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Solution

The fourth proportional to 1,221.38, 1,685.51 and 1,177.23 is: 1,624.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.38 : 1,685.51 = 1,177.23 : x
  2. Step 2: Convert to fraction form
    1,221.38/1,685.51 = 1,177.23/x
  3. Step 3: Cross multiply
    1,221.38x = 1,685.51 × 1,177.23
  4. Step 4: Simplify right side
    1,221.38x = 1,984,237.79
  5. Step 5: Solve for x
    x = 1,984,237.79/1,221.38
  6. Step 6: Final answer
    x = 1,624.59

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Half scale
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Double scale
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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.