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Finding the Fourth Proportional to 72.15, 107.65 and 64.63

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Solution

The fourth proportional to 72.15, 107.65 and 64.63 is: 96.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.15 : 107.65 = 64.63 : x
  2. Step 2: Convert to fraction form
    72.15/107.65 = 64.63/x
  3. Step 3: Cross multiply
    72.15x = 107.65 × 64.63
  4. Step 4: Simplify right side
    72.15x = 6,957.42
  5. Step 5: Solve for x
    x = 6,957.42/72.15
  6. Step 6: Final answer
    x = 96.43

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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.