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Finding the Fourth Proportional to 85.28, 117.69 and 47.43

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Solution

The fourth proportional to 85.28, 117.69 and 47.43 is: 65.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.28 : 117.69 = 47.43 : x
  2. Step 2: Convert to fraction form
    85.28/117.69 = 47.43/x
  3. Step 3: Cross multiply
    85.28x = 117.69 × 47.43
  4. Step 4: Simplify right side
    85.28x = 5,581.74
  5. Step 5: Solve for x
    x = 5,581.74/85.28
  6. Step 6: Final answer
    x = 65.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.