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Finding the Fourth Proportional to 157.86, 218.07 and 153.81

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Solution

The fourth proportional to 157.86, 218.07 and 153.81 is: 212.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.86 : 218.07 = 153.81 : x
  2. Step 2: Convert to fraction form
    157.86/218.07 = 153.81/x
  3. Step 3: Cross multiply
    157.86x = 218.07 × 153.81
  4. Step 4: Simplify right side
    157.86x = 33,541.35
  5. Step 5: Solve for x
    x = 33,541.35/157.86
  6. Step 6: Final answer
    x = 212.48

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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.