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Finding the Fourth Proportional to 157.08, 216.78 and 137.64

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Solution

The fourth proportional to 157.08, 216.78 and 137.64 is: 189.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.08 : 216.78 = 137.64 : x
  2. Step 2: Convert to fraction form
    157.08/216.78 = 137.64/x
  3. Step 3: Cross multiply
    157.08x = 216.78 × 137.64
  4. Step 4: Simplify right side
    157.08x = 29,837.60
  5. Step 5: Solve for x
    x = 29,837.60/157.08
  6. Step 6: Final answer
    x = 189.95

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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.