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Finding the Fourth Proportional to 157.86, 216.41 and 155.34

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Solution

The fourth proportional to 157.86, 216.41 and 155.34 is: 212.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.86 : 216.41 = 155.34 : x
  2. Step 2: Convert to fraction form
    157.86/216.41 = 155.34/x
  3. Step 3: Cross multiply
    157.86x = 216.41 × 155.34
  4. Step 4: Simplify right side
    157.86x = 33,616.35
  5. Step 5: Solve for x
    x = 33,616.35/157.86
  6. Step 6: Final answer
    x = 212.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.