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Finding the Fourth Proportional to 744.38, 1,027.38 and 707.21

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Solution

The fourth proportional to 744.38, 1,027.38 and 707.21 is: 976.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.38 : 1,027.38 = 707.21 : x
  2. Step 2: Convert to fraction form
    744.38/1,027.38 = 707.21/x
  3. Step 3: Cross multiply
    744.38x = 1,027.38 × 707.21
  4. Step 4: Simplify right side
    744.38x = 726,575.98
  5. Step 5: Solve for x
    x = 726,575.98/744.38
  6. Step 6: Final answer
    x = 976.08

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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.