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Finding the Fourth Proportional to 157.01, 216.72 and 91.49

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Solution

The fourth proportional to 157.01, 216.72 and 91.49 is: 126.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.01 : 216.72 = 91.49 : x
  2. Step 2: Convert to fraction form
    157.01/216.72 = 91.49/x
  3. Step 3: Cross multiply
    157.01x = 216.72 × 91.49
  4. Step 4: Simplify right side
    157.01x = 19,826.63
  5. Step 5: Solve for x
    x = 19,826.63/157.01
  6. Step 6: Final answer
    x = 126.28

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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.