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Finding the Fourth Proportional to 935.79, 1,403.91 and 286.48

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Solution

The fourth proportional to 935.79, 1,403.91 and 286.48 is: 429.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.79 : 1,403.91 = 286.48 : x
  2. Step 2: Convert to fraction form
    935.79/1,403.91 = 286.48/x
  3. Step 3: Cross multiply
    935.79x = 1,403.91 × 286.48
  4. Step 4: Simplify right side
    935.79x = 402,192.14
  5. Step 5: Solve for x
    x = 402,192.14/935.79
  6. Step 6: Final answer
    x = 429.79

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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.