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Finding the Fourth Proportional to 287.66, 430.38 and 191.66

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Solution

The fourth proportional to 287.66, 430.38 and 191.66 is: 286.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.66 : 430.38 = 191.66 : x
  2. Step 2: Convert to fraction form
    287.66/430.38 = 191.66/x
  3. Step 3: Cross multiply
    287.66x = 430.38 × 191.66
  4. Step 4: Simplify right side
    287.66x = 82,486.63
  5. Step 5: Solve for x
    x = 82,486.63/287.66
  6. Step 6: Final answer
    x = 286.75

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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.