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Finding the Fourth Proportional to 718.05, 990.88 and 403.31

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Solution

The fourth proportional to 718.05, 990.88 and 403.31 is: 556.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.05 : 990.88 = 403.31 : x
  2. Step 2: Convert to fraction form
    718.05/990.88 = 403.31/x
  3. Step 3: Cross multiply
    718.05x = 990.88 × 403.31
  4. Step 4: Simplify right side
    718.05x = 399,633.28
  5. Step 5: Solve for x
    x = 399,633.28/718.05
  6. Step 6: Final answer
    x = 556.55

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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.