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Finding the Fourth Proportional to 931.06, 1,284.87 and 517.06

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Solution

The fourth proportional to 931.06, 1,284.87 and 517.06 is: 713.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.06 : 1,284.87 = 517.06 : x
  2. Step 2: Convert to fraction form
    931.06/1,284.87 = 517.06/x
  3. Step 3: Cross multiply
    931.06x = 1,284.87 × 517.06
  4. Step 4: Simplify right side
    931.06x = 664,354.88
  5. Step 5: Solve for x
    x = 664,354.88/931.06
  6. Step 6: Final answer
    x = 713.55

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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.