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Finding the Fourth Proportional to 71.60, 106.56 and 70.16

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Solution

The fourth proportional to 71.60, 106.56 and 70.16 is: 104.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.60 : 106.56 = 70.16 : x
  2. Step 2: Convert to fraction form
    71.60/106.56 = 70.16/x
  3. Step 3: Cross multiply
    71.60x = 106.56 × 70.16
  4. Step 4: Simplify right side
    71.60x = 7,476.25
  5. Step 5: Solve for x
    x = 7,476.25/71.60
  6. Step 6: Final answer
    x = 104.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.