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Finding the Fourth Proportional to 69.91, 96.65 and 53.51

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Solution

The fourth proportional to 69.91, 96.65 and 53.51 is: 73.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.91 : 96.65 = 53.51 : x
  2. Step 2: Convert to fraction form
    69.91/96.65 = 53.51/x
  3. Step 3: Cross multiply
    69.91x = 96.65 × 53.51
  4. Step 4: Simplify right side
    69.91x = 5,171.74
  5. Step 5: Solve for x
    x = 5,171.74/69.91
  6. Step 6: Final answer
    x = 73.98

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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.