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Finding the Fourth Proportional to 64.15, 95.67 and 55.07

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Solution

The fourth proportional to 64.15, 95.67 and 55.07 is: 82.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.15 : 95.67 = 55.07 : x
  2. Step 2: Convert to fraction form
    64.15/95.67 = 55.07/x
  3. Step 3: Cross multiply
    64.15x = 95.67 × 55.07
  4. Step 4: Simplify right side
    64.15x = 5,268.55
  5. Step 5: Solve for x
    x = 5,268.55/64.15
  6. Step 6: Final answer
    x = 82.13

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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.