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Finding the Fourth Proportional to 65, 89.65 and 54.74

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Solution

The fourth proportional to 65, 89.65 and 54.74 is: 75.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    65 : 89.65 = 54.74 : x
  2. Step 2: Convert to fraction form
    65/89.65 = 54.74/x
  3. Step 3: Cross multiply
    65x = 89.65 × 54.74
  4. Step 4: Simplify right side
    65x = 4,907.44
  5. Step 5: Solve for x
    x = 4,907.44/65
  6. Step 6: Final answer
    x = 75.50

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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.