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Finding the Fourth Proportional to 748.07, 1,120.74 and 638.72

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Solution

The fourth proportional to 748.07, 1,120.74 and 638.72 is: 956.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.07 : 1,120.74 = 638.72 : x
  2. Step 2: Convert to fraction form
    748.07/1,120.74 = 638.72/x
  3. Step 3: Cross multiply
    748.07x = 1,120.74 × 638.72
  4. Step 4: Simplify right side
    748.07x = 715,835.26
  5. Step 5: Solve for x
    x = 715,835.26/748.07
  6. Step 6: Final answer
    x = 956.91

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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.