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Finding the Fourth Proportional to 116.79, 161.18 and 64.35

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Solution

The fourth proportional to 116.79, 161.18 and 64.35 is: 88.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.79 : 161.18 = 64.35 : x
  2. Step 2: Convert to fraction form
    116.79/161.18 = 64.35/x
  3. Step 3: Cross multiply
    116.79x = 161.18 × 64.35
  4. Step 4: Simplify right side
    116.79x = 10,371.35
  5. Step 5: Solve for x
    x = 10,371.35/116.79
  6. Step 6: Final answer
    x = 88.80

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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.