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Finding the Fourth Proportional to 345.07, 517.61 and 85.07

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Solution

The fourth proportional to 345.07, 517.61 and 85.07 is: 127.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.07 : 517.61 = 85.07 : x
  2. Step 2: Convert to fraction form
    345.07/517.61 = 85.07/x
  3. Step 3: Cross multiply
    345.07x = 517.61 × 85.07
  4. Step 4: Simplify right side
    345.07x = 44,033.08
  5. Step 5: Solve for x
    x = 44,033.08/345.07
  6. Step 6: Final answer
    x = 127.61

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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.