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Finding the Fourth Proportional to 345.35, 518.04 and 139.88

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Solution

The fourth proportional to 345.35, 518.04 and 139.88 is: 209.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.35 : 518.04 = 139.88 : x
  2. Step 2: Convert to fraction form
    345.35/518.04 = 139.88/x
  3. Step 3: Cross multiply
    345.35x = 518.04 × 139.88
  4. Step 4: Simplify right side
    345.35x = 72,462.74
  5. Step 5: Solve for x
    x = 72,462.74/345.35
  6. Step 6: Final answer
    x = 209.83

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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.