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Finding the Fourth Proportional to 64.18, 95.80 and 55.06

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Solution

The fourth proportional to 64.18, 95.80 and 55.06 is: 82.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.18 : 95.80 = 55.06 : x
  2. Step 2: Convert to fraction form
    64.18/95.80 = 55.06/x
  3. Step 3: Cross multiply
    64.18x = 95.80 × 55.06
  4. Step 4: Simplify right side
    64.18x = 5,274.75
  5. Step 5: Solve for x
    x = 5,274.75/64.18
  6. Step 6: Final answer
    x = 82.19

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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.