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Finding the Fourth Proportional to 721.13, 993.06 and 637.83

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Solution

The fourth proportional to 721.13, 993.06 and 637.83 is: 878.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.13 : 993.06 = 637.83 : x
  2. Step 2: Convert to fraction form
    721.13/993.06 = 637.83/x
  3. Step 3: Cross multiply
    721.13x = 993.06 × 637.83
  4. Step 4: Simplify right side
    721.13x = 633,403.46
  5. Step 5: Solve for x
    x = 633,403.46/721.13
  6. Step 6: Final answer
    x = 878.35

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1.5x scale

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.