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Finding the Fourth Proportional to 716.38, 988.56 and 401.67

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Solution

The fourth proportional to 716.38, 988.56 and 401.67 is: 554.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.38 : 988.56 = 401.67 : x
  2. Step 2: Convert to fraction form
    716.38/988.56 = 401.67/x
  3. Step 3: Cross multiply
    716.38x = 988.56 × 401.67
  4. Step 4: Simplify right side
    716.38x = 397,075.90
  5. Step 5: Solve for x
    x = 397,075.90/716.38
  6. Step 6: Final answer
    x = 554.28

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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.