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Finding the Fourth Proportional to 72.56, 100.08 and 64.76

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Solution

The fourth proportional to 72.56, 100.08 and 64.76 is: 89.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.56 : 100.08 = 64.76 : x
  2. Step 2: Convert to fraction form
    72.56/100.08 = 64.76/x
  3. Step 3: Cross multiply
    72.56x = 100.08 × 64.76
  4. Step 4: Simplify right side
    72.56x = 6,480.68
  5. Step 5: Solve for x
    x = 6,480.68/72.56
  6. Step 6: Final answer
    x = 89.31

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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.