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Finding the Fourth Proportional to 156.79, 216.44 and 97.81

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Solution

The fourth proportional to 156.79, 216.44 and 97.81 is: 135.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.79 : 216.44 = 97.81 : x
  2. Step 2: Convert to fraction form
    156.79/216.44 = 97.81/x
  3. Step 3: Cross multiply
    156.79x = 216.44 × 97.81
  4. Step 4: Simplify right side
    156.79x = 21,168.82
  5. Step 5: Solve for x
    x = 21,168.82/156.79
  6. Step 6: Final answer
    x = 135.01

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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.