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Finding the Fourth Proportional to 43.63, 64.99 and 42.15

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Solution

The fourth proportional to 43.63, 64.99 and 42.15 is: 62.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.63 : 64.99 = 42.15 : x
  2. Step 2: Convert to fraction form
    43.63/64.99 = 42.15/x
  3. Step 3: Cross multiply
    43.63x = 64.99 × 42.15
  4. Step 4: Simplify right side
    43.63x = 2,739.33
  5. Step 5: Solve for x
    x = 2,739.33/43.63
  6. Step 6: Final answer
    x = 62.79

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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.