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Finding the Fourth Proportional to 749.05, 1,123.57 and 193.76

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Solution

The fourth proportional to 749.05, 1,123.57 and 193.76 is: 290.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.05 : 1,123.57 = 193.76 : x
  2. Step 2: Convert to fraction form
    749.05/1,123.57 = 193.76/x
  3. Step 3: Cross multiply
    749.05x = 1,123.57 × 193.76
  4. Step 4: Simplify right side
    749.05x = 217,696.82
  5. Step 5: Solve for x
    x = 217,696.82/749.05
  6. Step 6: Final answer
    x = 290.63

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.