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Finding the Fourth Proportional to 70.62, 105.48 and 61.02

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Solution

The fourth proportional to 70.62, 105.48 and 61.02 is: 91.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.62 : 105.48 = 61.02 : x
  2. Step 2: Convert to fraction form
    70.62/105.48 = 61.02/x
  3. Step 3: Cross multiply
    70.62x = 105.48 × 61.02
  4. Step 4: Simplify right side
    70.62x = 6,436.08
  5. Step 5: Solve for x
    x = 6,436.08/70.62
  6. Step 6: Final answer
    x = 91.14

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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.