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Finding the Fourth Proportional to 749.39, 1,122.54 and 440.30

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Solution

The fourth proportional to 749.39, 1,122.54 and 440.30 is: 659.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.39 : 1,122.54 = 440.30 : x
  2. Step 2: Convert to fraction form
    749.39/1,122.54 = 440.30/x
  3. Step 3: Cross multiply
    749.39x = 1,122.54 × 440.30
  4. Step 4: Simplify right side
    749.39x = 494,254.36
  5. Step 5: Solve for x
    x = 494,254.36/749.39
  6. Step 6: Final answer
    x = 659.54

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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.