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Finding the Fourth Proportional to 85.20, 117.58 and 46.39

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Solution

The fourth proportional to 85.20, 117.58 and 46.39 is: 64.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.20 : 117.58 = 46.39 : x
  2. Step 2: Convert to fraction form
    85.20/117.58 = 46.39/x
  3. Step 3: Cross multiply
    85.20x = 117.58 × 46.39
  4. Step 4: Simplify right side
    85.20x = 5,454.68
  5. Step 5: Solve for x
    x = 5,454.68/85.20
  6. Step 6: Final answer
    x = 64.02

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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.