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Finding the Fourth Proportional to 42.87, 64.23 and 34.36

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Solution

The fourth proportional to 42.87, 64.23 and 34.36 is: 51.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.87 : 64.23 = 34.36 : x
  2. Step 2: Convert to fraction form
    42.87/64.23 = 34.36/x
  3. Step 3: Cross multiply
    42.87x = 64.23 × 34.36
  4. Step 4: Simplify right side
    42.87x = 2,206.94
  5. Step 5: Solve for x
    x = 2,206.94/42.87
  6. Step 6: Final answer
    x = 51.49

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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.