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Finding the Fourth Proportional to 718.06, 990.92 and 403.28

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Solution

The fourth proportional to 718.06, 990.92 and 403.28 is: 556.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.06 : 990.92 = 403.28 : x
  2. Step 2: Convert to fraction form
    718.06/990.92 = 403.28/x
  3. Step 3: Cross multiply
    718.06x = 990.92 × 403.28
  4. Step 4: Simplify right side
    718.06x = 399,618.22
  5. Step 5: Solve for x
    x = 399,618.22/718.06
  6. Step 6: Final answer
    x = 556.52

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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.