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Finding the Fourth Proportional to 85.32, 117.63 and 70.74

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Solution

The fourth proportional to 85.32, 117.63 and 70.74 is: 97.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.32 : 117.63 = 70.74 : x
  2. Step 2: Convert to fraction form
    85.32/117.63 = 70.74/x
  3. Step 3: Cross multiply
    85.32x = 117.63 × 70.74
  4. Step 4: Simplify right side
    85.32x = 8,321.15
  5. Step 5: Solve for x
    x = 8,321.15/85.32
  6. Step 6: Final answer
    x = 97.53

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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.