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Finding the Fourth Proportional to 345.81, 517.95 and 209.02

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Solution

The fourth proportional to 345.81, 517.95 and 209.02 is: 313.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.81 : 517.95 = 209.02 : x
  2. Step 2: Convert to fraction form
    345.81/517.95 = 209.02/x
  3. Step 3: Cross multiply
    345.81x = 517.95 × 209.02
  4. Step 4: Simplify right side
    345.81x = 108,261.91
  5. Step 5: Solve for x
    x = 108,261.91/345.81
  6. Step 6: Final answer
    x = 313.07

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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.