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Finding the Fourth Proportional to 715.99, 988.10 and 401.26

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Solution

The fourth proportional to 715.99, 988.10 and 401.26 is: 553.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.99 : 988.10 = 401.26 : x
  2. Step 2: Convert to fraction form
    715.99/988.10 = 401.26/x
  3. Step 3: Cross multiply
    715.99x = 988.10 × 401.26
  4. Step 4: Simplify right side
    715.99x = 396,485.01
  5. Step 5: Solve for x
    x = 396,485.01/715.99
  6. Step 6: Final answer
    x = 553.76

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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.