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Finding the Fourth Proportional to 85.40, 117.86 and 52.64

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Solution

The fourth proportional to 85.40, 117.86 and 52.64 is: 72.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.40 : 117.86 = 52.64 : x
  2. Step 2: Convert to fraction form
    85.40/117.86 = 52.64/x
  3. Step 3: Cross multiply
    85.40x = 117.86 × 52.64
  4. Step 4: Simplify right side
    85.40x = 6,204.15
  5. Step 5: Solve for x
    x = 6,204.15/85.40
  6. Step 6: Final answer
    x = 72.65

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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.