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Finding the Fourth Proportional to 79.62, 109.71 and 70.35

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Solution

The fourth proportional to 79.62, 109.71 and 70.35 is: 96.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.62 : 109.71 = 70.35 : x
  2. Step 2: Convert to fraction form
    79.62/109.71 = 70.35/x
  3. Step 3: Cross multiply
    79.62x = 109.71 × 70.35
  4. Step 4: Simplify right side
    79.62x = 7,718.10
  5. Step 5: Solve for x
    x = 7,718.10/79.62
  6. Step 6: Final answer
    x = 96.94

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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.