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Finding the Fourth Proportional to 935.97, 1,405.59 and 862.71

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Solution

The fourth proportional to 935.97, 1,405.59 and 862.71 is: 1,295.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.97 : 1,405.59 = 862.71 : x
  2. Step 2: Convert to fraction form
    935.97/1,405.59 = 862.71/x
  3. Step 3: Cross multiply
    935.97x = 1,405.59 × 862.71
  4. Step 4: Simplify right side
    935.97x = 1,212,616.55
  5. Step 5: Solve for x
    x = 1,212,616.55/935.97
  6. Step 6: Final answer
    x = 1,295.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.