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Finding the Fourth Proportional to 287.23, 430.36 and 156.94

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Solution

The fourth proportional to 287.23, 430.36 and 156.94 is: 235.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.23 : 430.36 = 156.94 : x
  2. Step 2: Convert to fraction form
    287.23/430.36 = 156.94/x
  3. Step 3: Cross multiply
    287.23x = 430.36 × 156.94
  4. Step 4: Simplify right side
    287.23x = 67,540.70
  5. Step 5: Solve for x
    x = 67,540.70/287.23
  6. Step 6: Final answer
    x = 235.15

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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.