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Finding the Fourth Proportional to 931.52, 1,286.06 and 617.05

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Solution

The fourth proportional to 931.52, 1,286.06 and 617.05 is: 851.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.52 : 1,286.06 = 617.05 : x
  2. Step 2: Convert to fraction form
    931.52/1,286.06 = 617.05/x
  3. Step 3: Cross multiply
    931.52x = 1,286.06 × 617.05
  4. Step 4: Simplify right side
    931.52x = 793,567.73
  5. Step 5: Solve for x
    x = 793,567.73/931.52
  6. Step 6: Final answer
    x = 851.91

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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.