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Finding the Fourth Proportional to 85.36, 117.96 and 64.70

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Solution

The fourth proportional to 85.36, 117.96 and 64.70 is: 89.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.36 : 117.96 = 64.70 : x
  2. Step 2: Convert to fraction form
    85.36/117.96 = 64.70/x
  3. Step 3: Cross multiply
    85.36x = 117.96 × 64.70
  4. Step 4: Simplify right side
    85.36x = 7,632.01
  5. Step 5: Solve for x
    x = 7,632.01/85.36
  6. Step 6: Final answer
    x = 89.41

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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.