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Finding the Fourth Proportional to 718.10, 990.90 and 403.37

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Solution

The fourth proportional to 718.10, 990.90 and 403.37 is: 556.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.10 : 990.90 = 403.37 : x
  2. Step 2: Convert to fraction form
    718.10/990.90 = 403.37/x
  3. Step 3: Cross multiply
    718.10x = 990.90 × 403.37
  4. Step 4: Simplify right side
    718.10x = 399,701.81
  5. Step 5: Solve for x
    x = 399,701.81/718.10
  6. Step 6: Final answer
    x = 556.61

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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.