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Finding the Fourth Proportional to 716.40, 988.47 and 495.81

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Solution

The fourth proportional to 716.40, 988.47 and 495.81 is: 684.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.40 : 988.47 = 495.81 : x
  2. Step 2: Convert to fraction form
    716.40/988.47 = 495.81/x
  3. Step 3: Cross multiply
    716.40x = 988.47 × 495.81
  4. Step 4: Simplify right side
    716.40x = 490,093.31
  5. Step 5: Solve for x
    x = 490,093.31/716.40
  6. Step 6: Final answer
    x = 684.11

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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.