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Finding the Fourth Proportional to 207.01, 311.10 and 139.00

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Solution

The fourth proportional to 207.01, 311.10 and 139.00 is: 208.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.01 : 311.10 = 139.00 : x
  2. Step 2: Convert to fraction form
    207.01/311.10 = 139.00/x
  3. Step 3: Cross multiply
    207.01x = 311.10 × 139.00
  4. Step 4: Simplify right side
    207.01x = 43,242.12
  5. Step 5: Solve for x
    x = 43,242.12/207.01
  6. Step 6: Final answer
    x = 208.89

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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.