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Finding the Fourth Proportional to 72.37, 99.78 and 66.23

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Solution

The fourth proportional to 72.37, 99.78 and 66.23 is: 91.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.37 : 99.78 = 66.23 : x
  2. Step 2: Convert to fraction form
    72.37/99.78 = 66.23/x
  3. Step 3: Cross multiply
    72.37x = 99.78 × 66.23
  4. Step 4: Simplify right side
    72.37x = 6,607.93
  5. Step 5: Solve for x
    x = 6,607.93/72.37
  6. Step 6: Final answer
    x = 91.31

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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.