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Finding the Fourth Proportional to 72, 99.22 and 66.19

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Solution

The fourth proportional to 72, 99.22 and 66.19 is: 91.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72 : 99.22 = 66.19 : x
  2. Step 2: Convert to fraction form
    72/99.22 = 66.19/x
  3. Step 3: Cross multiply
    72x = 99.22 × 66.19
  4. Step 4: Simplify right side
    72x = 6,567.37
  5. Step 5: Solve for x
    x = 6,567.37/72
  6. Step 6: Final answer
    x = 91.21

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1.5x scale

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.