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Finding the Fourth Proportional to 749.15, 1,031.63 and 638.58

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Solution

The fourth proportional to 749.15, 1,031.63 and 638.58 is: 879.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.15 : 1,031.63 = 638.58 : x
  2. Step 2: Convert to fraction form
    749.15/1,031.63 = 638.58/x
  3. Step 3: Cross multiply
    749.15x = 1,031.63 × 638.58
  4. Step 4: Simplify right side
    749.15x = 658,775.09
  5. Step 5: Solve for x
    x = 658,775.09/749.15
  6. Step 6: Final answer
    x = 879.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.