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Finding the Fourth Proportional to 345.83, 518.90 and 140.80

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Solution

The fourth proportional to 345.83, 518.90 and 140.80 is: 211.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.83 : 518.90 = 140.80 : x
  2. Step 2: Convert to fraction form
    345.83/518.90 = 140.80/x
  3. Step 3: Cross multiply
    345.83x = 518.90 × 140.80
  4. Step 4: Simplify right side
    345.83x = 73,061.12
  5. Step 5: Solve for x
    x = 73,061.12/345.83
  6. Step 6: Final answer
    x = 211.26

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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.