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Finding the Fourth Proportional to 157.02, 218.15 and 155.61

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Solution

The fourth proportional to 157.02, 218.15 and 155.61 is: 216.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.02 : 218.15 = 155.61 : x
  2. Step 2: Convert to fraction form
    157.02/218.15 = 155.61/x
  3. Step 3: Cross multiply
    157.02x = 218.15 × 155.61
  4. Step 4: Simplify right side
    157.02x = 33,945.54
  5. Step 5: Solve for x
    x = 33,945.54/157.02
  6. Step 6: Final answer
    x = 216.19

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.