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Finding the Fourth Proportional to 287, 430.09 and 156.72

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Solution

The fourth proportional to 287, 430.09 and 156.72 is: 234.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    287 : 430.09 = 156.72 : x
  2. Step 2: Convert to fraction form
    287/430.09 = 156.72/x
  3. Step 3: Cross multiply
    287x = 430.09 × 156.72
  4. Step 4: Simplify right side
    287x = 67,403.70
  5. Step 5: Solve for x
    x = 67,403.70/287
  6. Step 6: Final answer
    x = 234.86

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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.