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Finding the Fourth Proportional to 85.34, 117.59 and 64.69

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Solution

The fourth proportional to 85.34, 117.59 and 64.69 is: 89.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.34 : 117.59 = 64.69 : x
  2. Step 2: Convert to fraction form
    85.34/117.59 = 64.69/x
  3. Step 3: Cross multiply
    85.34x = 117.59 × 64.69
  4. Step 4: Simplify right side
    85.34x = 7,606.28
  5. Step 5: Solve for x
    x = 7,606.28/85.34
  6. Step 6: Final answer
    x = 89.13

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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.