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Finding the Fourth Proportional to 747.23, 1,115.37 and 643.34

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Solution

The fourth proportional to 747.23, 1,115.37 and 643.34 is: 960.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.23 : 1,115.37 = 643.34 : x
  2. Step 2: Convert to fraction form
    747.23/1,115.37 = 643.34/x
  3. Step 3: Cross multiply
    747.23x = 1,115.37 × 643.34
  4. Step 4: Simplify right side
    747.23x = 717,564.92
  5. Step 5: Solve for x
    x = 717,564.92/747.23
  6. Step 6: Final answer
    x = 960.31

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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.