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Finding the Fourth Proportional to 43.64, 65.12 and 43.28

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Solution

The fourth proportional to 43.64, 65.12 and 43.28 is: 64.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.64 : 65.12 = 43.28 : x
  2. Step 2: Convert to fraction form
    43.64/65.12 = 43.28/x
  3. Step 3: Cross multiply
    43.64x = 65.12 × 43.28
  4. Step 4: Simplify right side
    43.64x = 2,818.39
  5. Step 5: Solve for x
    x = 2,818.39/43.64
  6. Step 6: Final answer
    x = 64.58

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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.