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Finding the Fourth Proportional to 99.51, 137.34 and 66.31

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Solution

The fourth proportional to 99.51, 137.34 and 66.31 is: 91.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.51 : 137.34 = 66.31 : x
  2. Step 2: Convert to fraction form
    99.51/137.34 = 66.31/x
  3. Step 3: Cross multiply
    99.51x = 137.34 × 66.31
  4. Step 4: Simplify right side
    99.51x = 9,107.51
  5. Step 5: Solve for x
    x = 9,107.51/99.51
  6. Step 6: Final answer
    x = 91.53

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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.