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Finding the Fourth Proportional to 43.10, 64.68 and 20.30

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Solution

The fourth proportional to 43.10, 64.68 and 20.30 is: 30.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.10 : 64.68 = 20.30 : x
  2. Step 2: Convert to fraction form
    43.10/64.68 = 20.30/x
  3. Step 3: Cross multiply
    43.10x = 64.68 × 20.30
  4. Step 4: Simplify right side
    43.10x = 1,312.68
  5. Step 5: Solve for x
    x = 1,312.68/43.10
  6. Step 6: Final answer
    x = 30.46

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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.