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Finding the Fourth Proportional to 716.69, 988.47 and 480.57

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Solution

The fourth proportional to 716.69, 988.47 and 480.57 is: 662.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.69 : 988.47 = 480.57 : x
  2. Step 2: Convert to fraction form
    716.69/988.47 = 480.57/x
  3. Step 3: Cross multiply
    716.69x = 988.47 × 480.57
  4. Step 4: Simplify right side
    716.69x = 475,025.29
  5. Step 5: Solve for x
    x = 475,025.29/716.69
  6. Step 6: Final answer
    x = 662.80

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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.