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Finding the Fourth Proportional to 717.88, 990.74 and 403.20

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Solution

The fourth proportional to 717.88, 990.74 and 403.20 is: 556.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.88 : 990.74 = 403.20 : x
  2. Step 2: Convert to fraction form
    717.88/990.74 = 403.20/x
  3. Step 3: Cross multiply
    717.88x = 990.74 × 403.20
  4. Step 4: Simplify right side
    717.88x = 399,466.37
  5. Step 5: Solve for x
    x = 399,466.37/717.88
  6. Step 6: Final answer
    x = 556.45

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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.