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Finding the Fourth Proportional to 345.39, 518.08 and 139.95

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Solution

The fourth proportional to 345.39, 518.08 and 139.95 is: 209.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.39 : 518.08 = 139.95 : x
  2. Step 2: Convert to fraction form
    345.39/518.08 = 139.95/x
  3. Step 3: Cross multiply
    345.39x = 518.08 × 139.95
  4. Step 4: Simplify right side
    345.39x = 72,506.89
  5. Step 5: Solve for x
    x = 72,506.89/345.39
  6. Step 6: Final answer
    x = 209.93

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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.