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Finding the Fourth Proportional to 64.98, 89.66 and 55.85

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Solution

The fourth proportional to 64.98, 89.66 and 55.85 is: 77.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.98 : 89.66 = 55.85 : x
  2. Step 2: Convert to fraction form
    64.98/89.66 = 55.85/x
  3. Step 3: Cross multiply
    64.98x = 89.66 × 55.85
  4. Step 4: Simplify right side
    64.98x = 5,007.20
  5. Step 5: Solve for x
    x = 5,007.20/64.98
  6. Step 6: Final answer
    x = 77.06

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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.