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Finding the Fourth Proportional to 70.40, 105.46 and 66.08

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Solution

The fourth proportional to 70.40, 105.46 and 66.08 is: 98.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.40 : 105.46 = 66.08 : x
  2. Step 2: Convert to fraction form
    70.40/105.46 = 66.08/x
  3. Step 3: Cross multiply
    70.40x = 105.46 × 66.08
  4. Step 4: Simplify right side
    70.40x = 6,968.80
  5. Step 5: Solve for x
    x = 6,968.80/70.40
  6. Step 6: Final answer
    x = 98.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.