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Finding the Fourth Proportional to 229.70, 317.18 and 156.29

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Solution

The fourth proportional to 229.70, 317.18 and 156.29 is: 215.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.70 : 317.18 = 156.29 : x
  2. Step 2: Convert to fraction form
    229.70/317.18 = 156.29/x
  3. Step 3: Cross multiply
    229.70x = 317.18 × 156.29
  4. Step 4: Simplify right side
    229.70x = 49,570.87
  5. Step 5: Solve for x
    x = 49,570.87/229.70
  6. Step 6: Final answer
    x = 215.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.