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Finding the Fourth Proportional to 935.91, 1,403.87 and 286.65

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Solution

The fourth proportional to 935.91, 1,403.87 and 286.65 is: 429.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.91 : 1,403.87 = 286.65 : x
  2. Step 2: Convert to fraction form
    935.91/1,403.87 = 286.65/x
  3. Step 3: Cross multiply
    935.91x = 1,403.87 × 286.65
  4. Step 4: Simplify right side
    935.91x = 402,419.34
  5. Step 5: Solve for x
    x = 402,419.34/935.91
  6. Step 6: Final answer
    x = 429.98

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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.