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Finding the Fourth Proportional to 511.56, 705.96 and 315

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Solution

The fourth proportional to 511.56, 705.96 and 315 is: 434.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.56 : 705.96 = 315 : x
  2. Step 2: Convert to fraction form
    511.56/705.96 = 315/x
  3. Step 3: Cross multiply
    511.56x = 705.96 × 315
  4. Step 4: Simplify right side
    511.56x = 222,377.40
  5. Step 5: Solve for x
    x = 222,377.40/511.56
  6. Step 6: Final answer
    x = 434.70

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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.