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Finding the Fourth Proportional to 188.78, 260.28 and 157.16

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Solution

The fourth proportional to 188.78, 260.28 and 157.16 is: 216.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.78 : 260.28 = 157.16 : x
  2. Step 2: Convert to fraction form
    188.78/260.28 = 157.16/x
  3. Step 3: Cross multiply
    188.78x = 260.28 × 157.16
  4. Step 4: Simplify right side
    188.78x = 40,905.60
  5. Step 5: Solve for x
    x = 40,905.60/188.78
  6. Step 6: Final answer
    x = 216.68

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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.