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Finding the Fourth Proportional to 43.13, 64.56 and 28.70

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Solution

The fourth proportional to 43.13, 64.56 and 28.70 is: 42.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.13 : 64.56 = 28.70 : x
  2. Step 2: Convert to fraction form
    43.13/64.56 = 28.70/x
  3. Step 3: Cross multiply
    43.13x = 64.56 × 28.70
  4. Step 4: Simplify right side
    43.13x = 1,852.87
  5. Step 5: Solve for x
    x = 1,852.87/43.13
  6. Step 6: Final answer
    x = 42.96

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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.