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Finding the Fourth Proportional to 287.27, 430.95 and 133.17

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Solution

The fourth proportional to 287.27, 430.95 and 133.17 is: 199.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.27 : 430.95 = 133.17 : x
  2. Step 2: Convert to fraction form
    287.27/430.95 = 133.17/x
  3. Step 3: Cross multiply
    287.27x = 430.95 × 133.17
  4. Step 4: Simplify right side
    287.27x = 57,389.61
  5. Step 5: Solve for x
    x = 57,389.61/287.27
  6. Step 6: Final answer
    x = 199.78

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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.