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Finding the Fourth Proportional to 935.81, 1,403.72 and 286.55

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Solution

The fourth proportional to 935.81, 1,403.72 and 286.55 is: 429.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.81 : 1,403.72 = 286.55 : x
  2. Step 2: Convert to fraction form
    935.81/1,403.72 = 286.55/x
  3. Step 3: Cross multiply
    935.81x = 1,403.72 × 286.55
  4. Step 4: Simplify right side
    935.81x = 402,235.97
  5. Step 5: Solve for x
    x = 402,235.97/935.81
  6. Step 6: Final answer
    x = 429.83

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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.