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Finding the Fourth Proportional to 72.62, 109.51 and 64.15

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Solution

The fourth proportional to 72.62, 109.51 and 64.15 is: 96.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.62 : 109.51 = 64.15 : x
  2. Step 2: Convert to fraction form
    72.62/109.51 = 64.15/x
  3. Step 3: Cross multiply
    72.62x = 109.51 × 64.15
  4. Step 4: Simplify right side
    72.62x = 7,025.07
  5. Step 5: Solve for x
    x = 7,025.07/72.62
  6. Step 6: Final answer
    x = 96.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.