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Finding the Fourth Proportional to 42.96, 64.12 and 36.84

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Solution

The fourth proportional to 42.96, 64.12 and 36.84 is: 54.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.96 : 64.12 = 36.84 : x
  2. Step 2: Convert to fraction form
    42.96/64.12 = 36.84/x
  3. Step 3: Cross multiply
    42.96x = 64.12 × 36.84
  4. Step 4: Simplify right side
    42.96x = 2,362.18
  5. Step 5: Solve for x
    x = 2,362.18/42.96
  6. Step 6: Final answer
    x = 54.99

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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.