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Finding the Fourth Proportional to 345.90, 518.66 and 140.58

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Solution

The fourth proportional to 345.90, 518.66 and 140.58 is: 210.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.90 : 518.66 = 140.58 : x
  2. Step 2: Convert to fraction form
    345.90/518.66 = 140.58/x
  3. Step 3: Cross multiply
    345.90x = 518.66 × 140.58
  4. Step 4: Simplify right side
    345.90x = 72,913.22
  5. Step 5: Solve for x
    x = 72,913.22/345.90
  6. Step 6: Final answer
    x = 210.79

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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.