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Finding the Fourth Proportional to 931.11, 1,284.98 and 517.11

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Solution

The fourth proportional to 931.11, 1,284.98 and 517.11 is: 713.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.11 : 1,284.98 = 517.11 : x
  2. Step 2: Convert to fraction form
    931.11/1,284.98 = 517.11/x
  3. Step 3: Cross multiply
    931.11x = 1,284.98 × 517.11
  4. Step 4: Simplify right side
    931.11x = 664,470.88
  5. Step 5: Solve for x
    x = 664,470.88/931.11
  6. Step 6: Final answer
    x = 713.64

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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.