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Finding the Fourth Proportional to 70.05, 104.46 and 66.39

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Solution

The fourth proportional to 70.05, 104.46 and 66.39 is: 99.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.05 : 104.46 = 66.39 : x
  2. Step 2: Convert to fraction form
    70.05/104.46 = 66.39/x
  3. Step 3: Cross multiply
    70.05x = 104.46 × 66.39
  4. Step 4: Simplify right side
    70.05x = 6,935.10
  5. Step 5: Solve for x
    x = 6,935.10/70.05
  6. Step 6: Final answer
    x = 99.00

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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.