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Finding the Fourth Proportional to 207.03, 310.61 and 85.36

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Solution

The fourth proportional to 207.03, 310.61 and 85.36 is: 128.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.03 : 310.61 = 85.36 : x
  2. Step 2: Convert to fraction form
    207.03/310.61 = 85.36/x
  3. Step 3: Cross multiply
    207.03x = 310.61 × 85.36
  4. Step 4: Simplify right side
    207.03x = 26,513.67
  5. Step 5: Solve for x
    x = 26,513.67/207.03
  6. Step 6: Final answer
    x = 128.07

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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.