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Finding the Fourth Proportional to 73.36, 109.81 and 42.90

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Solution

The fourth proportional to 73.36, 109.81 and 42.90 is: 64.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.36 : 109.81 = 42.90 : x
  2. Step 2: Convert to fraction form
    73.36/109.81 = 42.90/x
  3. Step 3: Cross multiply
    73.36x = 109.81 × 42.90
  4. Step 4: Simplify right side
    73.36x = 4,711.18
  5. Step 5: Solve for x
    x = 4,711.18/73.36
  6. Step 6: Final answer
    x = 64.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.