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Finding the Fourth Proportional to 286.79, 395.76 and 155.79

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Solution

The fourth proportional to 286.79, 395.76 and 155.79 is: 214.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.79 : 395.76 = 155.79 : x
  2. Step 2: Convert to fraction form
    286.79/395.76 = 155.79/x
  3. Step 3: Cross multiply
    286.79x = 395.76 × 155.79
  4. Step 4: Simplify right side
    286.79x = 61,655.45
  5. Step 5: Solve for x
    x = 61,655.45/286.79
  6. Step 6: Final answer
    x = 214.99

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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.