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Finding the Fourth Proportional to 1,211.88, 1,673.10 and 769.80

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Solution

The fourth proportional to 1,211.88, 1,673.10 and 769.80 is: 1,062.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.88 : 1,673.10 = 769.80 : x
  2. Step 2: Convert to fraction form
    1,211.88/1,673.10 = 769.80/x
  3. Step 3: Cross multiply
    1,211.88x = 1,673.10 × 769.80
  4. Step 4: Simplify right side
    1,211.88x = 1,287,952.38
  5. Step 5: Solve for x
    x = 1,287,952.38/1,211.88
  6. Step 6: Final answer
    x = 1,062.77

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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.