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Finding the Fourth Proportional to 749.02, 1,123.31 and 286.77

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Solution

The fourth proportional to 749.02, 1,123.31 and 286.77 is: 430.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.02 : 1,123.31 = 286.77 : x
  2. Step 2: Convert to fraction form
    749.02/1,123.31 = 286.77/x
  3. Step 3: Cross multiply
    749.02x = 1,123.31 × 286.77
  4. Step 4: Simplify right side
    749.02x = 322,125.04
  5. Step 5: Solve for x
    x = 322,125.04/749.02
  6. Step 6: Final answer
    x = 430.06

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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.