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Finding the Fourth Proportional to 749.50, 1,123.79 and 287.09

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Solution

The fourth proportional to 749.50, 1,123.79 and 287.09 is: 430.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.50 : 1,123.79 = 287.09 : x
  2. Step 2: Convert to fraction form
    749.50/1,123.79 = 287.09/x
  3. Step 3: Cross multiply
    749.50x = 1,123.79 × 287.09
  4. Step 4: Simplify right side
    749.50x = 322,621.82
  5. Step 5: Solve for x
    x = 322,621.82/749.50
  6. Step 6: Final answer
    x = 430.45

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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.