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Finding the Fourth Proportional to 85.25, 117.64 and 48.40

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Solution

The fourth proportional to 85.25, 117.64 and 48.40 is: 66.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.25 : 117.64 = 48.40 : x
  2. Step 2: Convert to fraction form
    85.25/117.64 = 48.40/x
  3. Step 3: Cross multiply
    85.25x = 117.64 × 48.40
  4. Step 4: Simplify right side
    85.25x = 5,693.74
  5. Step 5: Solve for x
    x = 5,693.74/85.25
  6. Step 6: Final answer
    x = 66.79

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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.