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Finding the Fourth Proportional to 43, 64.55 and 20.19

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Solution

The fourth proportional to 43, 64.55 and 20.19 is: 30.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    43 : 64.55 = 20.19 : x
  2. Step 2: Convert to fraction form
    43/64.55 = 20.19/x
  3. Step 3: Cross multiply
    43x = 64.55 × 20.19
  4. Step 4: Simplify right side
    43x = 1,303.32
  5. Step 5: Solve for x
    x = 1,303.32/43
  6. Step 6: Final answer
    x = 30.31

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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.