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Finding the Fourth Proportional to 345.74, 518.40 and 317.20

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Solution

The fourth proportional to 345.74, 518.40 and 317.20 is: 475.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.74 : 518.40 = 317.20 : x
  2. Step 2: Convert to fraction form
    345.74/518.40 = 317.20/x
  3. Step 3: Cross multiply
    345.74x = 518.40 × 317.20
  4. Step 4: Simplify right side
    345.74x = 164,436.48
  5. Step 5: Solve for x
    x = 164,436.48/345.74
  6. Step 6: Final answer
    x = 475.61

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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.