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Finding the Fourth Proportional to 287, 430.59 and 158.84

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Solution

The fourth proportional to 287, 430.59 and 158.84 is: 238.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    287 : 430.59 = 158.84 : x
  2. Step 2: Convert to fraction form
    287/430.59 = 158.84/x
  3. Step 3: Cross multiply
    287x = 430.59 × 158.84
  4. Step 4: Simplify right side
    287x = 68,394.92
  5. Step 5: Solve for x
    x = 68,394.92/287
  6. Step 6: Final answer
    x = 238.31

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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.