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Finding the Fourth Proportional to 718.65, 991.74 and 403.93

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Solution

The fourth proportional to 718.65, 991.74 and 403.93 is: 557.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.65 : 991.74 = 403.93 : x
  2. Step 2: Convert to fraction form
    718.65/991.74 = 403.93/x
  3. Step 3: Cross multiply
    718.65x = 991.74 × 403.93
  4. Step 4: Simplify right side
    718.65x = 400,593.54
  5. Step 5: Solve for x
    x = 400,593.54/718.65
  6. Step 6: Final answer
    x = 557.43

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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.