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Finding the Fourth Proportional to 70.81, 106.04 and 70.00

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Solution

The fourth proportional to 70.81, 106.04 and 70.00 is: 104.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.81 : 106.04 = 70.00 : x
  2. Step 2: Convert to fraction form
    70.81/106.04 = 70.00/x
  3. Step 3: Cross multiply
    70.81x = 106.04 × 70.00
  4. Step 4: Simplify right side
    70.81x = 7,422.71
  5. Step 5: Solve for x
    x = 7,422.71/70.81
  6. Step 6: Final answer
    x = 104.83

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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.