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Finding the Fourth Proportional to 751.73, 1,123.04 and 628.72

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Solution

The fourth proportional to 751.73, 1,123.04 and 628.72 is: 939.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.73 : 1,123.04 = 628.72 : x
  2. Step 2: Convert to fraction form
    751.73/1,123.04 = 628.72/x
  3. Step 3: Cross multiply
    751.73x = 1,123.04 × 628.72
  4. Step 4: Simplify right side
    751.73x = 706,071.76
  5. Step 5: Solve for x
    x = 706,071.76/751.73
  6. Step 6: Final answer
    x = 939.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.