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Finding the Fourth Proportional to 43.08, 64.59 and 19

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Solution

The fourth proportional to 43.08, 64.59 and 19 is: 28.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.08 : 64.59 = 19 : x
  2. Step 2: Convert to fraction form
    43.08/64.59 = 19/x
  3. Step 3: Cross multiply
    43.08x = 64.59 × 19
  4. Step 4: Simplify right side
    43.08x = 1,227.21
  5. Step 5: Solve for x
    x = 1,227.21/43.08
  6. Step 6: Final answer
    x = 28.49

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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.