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Finding the Fourth Proportional to 72.64, 108.50 and 66.58

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Solution

The fourth proportional to 72.64, 108.50 and 66.58 is: 99.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.64 : 108.50 = 66.58 : x
  2. Step 2: Convert to fraction form
    72.64/108.50 = 66.58/x
  3. Step 3: Cross multiply
    72.64x = 108.50 × 66.58
  4. Step 4: Simplify right side
    72.64x = 7,223.93
  5. Step 5: Solve for x
    x = 7,223.93/72.64
  6. Step 6: Final answer
    x = 99.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.