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Finding the Fourth Proportional to 721.37, 993.03 and 647.66

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Solution

The fourth proportional to 721.37, 993.03 and 647.66 is: 891.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.37 : 993.03 = 647.66 : x
  2. Step 2: Convert to fraction form
    721.37/993.03 = 647.66/x
  3. Step 3: Cross multiply
    721.37x = 993.03 × 647.66
  4. Step 4: Simplify right side
    721.37x = 643,145.81
  5. Step 5: Solve for x
    x = 643,145.81/721.37
  6. Step 6: Final answer
    x = 891.56

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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.