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Finding the Fourth Proportional to 156.81, 216.40 and 91.35

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Solution

The fourth proportional to 156.81, 216.40 and 91.35 is: 126.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.81 : 216.40 = 91.35 : x
  2. Step 2: Convert to fraction form
    156.81/216.40 = 91.35/x
  3. Step 3: Cross multiply
    156.81x = 216.40 × 91.35
  4. Step 4: Simplify right side
    156.81x = 19,768.14
  5. Step 5: Solve for x
    x = 19,768.14/156.81
  6. Step 6: Final answer
    x = 126.06

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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.