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Finding the Fourth Proportional to 157.35, 216.95 and 115.77

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Solution

The fourth proportional to 157.35, 216.95 and 115.77 is: 159.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.35 : 216.95 = 115.77 : x
  2. Step 2: Convert to fraction form
    157.35/216.95 = 115.77/x
  3. Step 3: Cross multiply
    157.35x = 216.95 × 115.77
  4. Step 4: Simplify right side
    157.35x = 25,115.72
  5. Step 5: Solve for x
    x = 25,115.72/157.35
  6. Step 6: Final answer
    x = 159.62

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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.