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Finding the Fourth Proportional to 207.21, 310.83 and 70.20

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Solution

The fourth proportional to 207.21, 310.83 and 70.20 is: 105.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.21 : 310.83 = 70.20 : x
  2. Step 2: Convert to fraction form
    207.21/310.83 = 70.20/x
  3. Step 3: Cross multiply
    207.21x = 310.83 × 70.20
  4. Step 4: Simplify right side
    207.21x = 21,820.27
  5. Step 5: Solve for x
    x = 21,820.27/207.21
  6. Step 6: Final answer
    x = 105.31

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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.