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Finding the Fourth Proportional to 716.43, 988.71 and 401.76

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Solution

The fourth proportional to 716.43, 988.71 and 401.76 is: 554.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.43 : 988.71 = 401.76 : x
  2. Step 2: Convert to fraction form
    716.43/988.71 = 401.76/x
  3. Step 3: Cross multiply
    716.43x = 988.71 × 401.76
  4. Step 4: Simplify right side
    716.43x = 397,224.13
  5. Step 5: Solve for x
    x = 397,224.13/716.43
  6. Step 6: Final answer
    x = 554.45

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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.