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Finding the Fourth Proportional to 61.28, 91.93 and 43.28

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Solution

The fourth proportional to 61.28, 91.93 and 43.28 is: 64.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.28 : 91.93 = 43.28 : x
  2. Step 2: Convert to fraction form
    61.28/91.93 = 43.28/x
  3. Step 3: Cross multiply
    61.28x = 91.93 × 43.28
  4. Step 4: Simplify right side
    61.28x = 3,978.16
  5. Step 5: Solve for x
    x = 3,978.16/61.28
  6. Step 6: Final answer
    x = 64.92

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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.