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Finding the Fourth Proportional to 718.03, 990.81 and 403.24

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Solution

The fourth proportional to 718.03, 990.81 and 403.24 is: 556.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.03 : 990.81 = 403.24 : x
  2. Step 2: Convert to fraction form
    718.03/990.81 = 403.24/x
  3. Step 3: Cross multiply
    718.03x = 990.81 × 403.24
  4. Step 4: Simplify right side
    718.03x = 399,534.22
  5. Step 5: Solve for x
    x = 399,534.22/718.03
  6. Step 6: Final answer
    x = 556.43

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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.