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Finding the Fourth Proportional to 85.81, 127.95 and 73.51

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Solution

The fourth proportional to 85.81, 127.95 and 73.51 is: 109.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.81 : 127.95 = 73.51 : x
  2. Step 2: Convert to fraction form
    85.81/127.95 = 73.51/x
  3. Step 3: Cross multiply
    85.81x = 127.95 × 73.51
  4. Step 4: Simplify right side
    85.81x = 9,405.01
  5. Step 5: Solve for x
    x = 9,405.01/85.81
  6. Step 6: Final answer
    x = 109.60

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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.