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Finding the Fourth Proportional to 717.93, 990.61 and 403.19

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Solution

The fourth proportional to 717.93, 990.61 and 403.19 is: 556.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.93 : 990.61 = 403.19 : x
  2. Step 2: Convert to fraction form
    717.93/990.61 = 403.19/x
  3. Step 3: Cross multiply
    717.93x = 990.61 × 403.19
  4. Step 4: Simplify right side
    717.93x = 399,401.80
  5. Step 5: Solve for x
    x = 399,401.80/717.93
  6. Step 6: Final answer
    x = 556.32

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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.