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Finding the Fourth Proportional to 72.58, 108.26 and 66.74

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Solution

The fourth proportional to 72.58, 108.26 and 66.74 is: 99.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.58 : 108.26 = 66.74 : x
  2. Step 2: Convert to fraction form
    72.58/108.26 = 66.74/x
  3. Step 3: Cross multiply
    72.58x = 108.26 × 66.74
  4. Step 4: Simplify right side
    72.58x = 7,225.27
  5. Step 5: Solve for x
    x = 7,225.27/72.58
  6. Step 6: Final answer
    x = 99.55

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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.