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Finding the Fourth Proportional to 717.79, 990.53 and 403.05

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Solution

The fourth proportional to 717.79, 990.53 and 403.05 is: 556.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.79 : 990.53 = 403.05 : x
  2. Step 2: Convert to fraction form
    717.79/990.53 = 403.05/x
  3. Step 3: Cross multiply
    717.79x = 990.53 × 403.05
  4. Step 4: Simplify right side
    717.79x = 399,234.59
  5. Step 5: Solve for x
    x = 399,234.59/717.79
  6. Step 6: Final answer
    x = 556.20

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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.