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Finding the Fourth Proportional to 215.92, 297.20 and 157.60

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Solution

The fourth proportional to 215.92, 297.20 and 157.60 is: 216.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.92 : 297.20 = 157.60 : x
  2. Step 2: Convert to fraction form
    215.92/297.20 = 157.60/x
  3. Step 3: Cross multiply
    215.92x = 297.20 × 157.60
  4. Step 4: Simplify right side
    215.92x = 46,838.72
  5. Step 5: Solve for x
    x = 46,838.72/215.92
  6. Step 6: Final answer
    x = 216.93

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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.