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Finding the Fourth Proportional to 351.70, 484.98 and 315.25

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Solution

The fourth proportional to 351.70, 484.98 and 315.25 is: 434.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.70 : 484.98 = 315.25 : x
  2. Step 2: Convert to fraction form
    351.70/484.98 = 315.25/x
  3. Step 3: Cross multiply
    351.70x = 484.98 × 315.25
  4. Step 4: Simplify right side
    351.70x = 152,889.95
  5. Step 5: Solve for x
    x = 152,889.95/351.70
  6. Step 6: Final answer
    x = 434.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.