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Finding the Fourth Proportional to 511.83, 705.99 and 315.47

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Solution

The fourth proportional to 511.83, 705.99 and 315.47 is: 435.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.83 : 705.99 = 315.47 : x
  2. Step 2: Convert to fraction form
    511.83/705.99 = 315.47/x
  3. Step 3: Cross multiply
    511.83x = 705.99 × 315.47
  4. Step 4: Simplify right side
    511.83x = 222,715.14
  5. Step 5: Solve for x
    x = 222,715.14/511.83
  6. Step 6: Final answer
    x = 435.13

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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.