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Finding the Fourth Proportional to 705.25, 1,057.86 and 315.15

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Solution

The fourth proportional to 705.25, 1,057.86 and 315.15 is: 472.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.25 : 1,057.86 = 315.15 : x
  2. Step 2: Convert to fraction form
    705.25/1,057.86 = 315.15/x
  3. Step 3: Cross multiply
    705.25x = 1,057.86 × 315.15
  4. Step 4: Simplify right side
    705.25x = 333,384.58
  5. Step 5: Solve for x
    x = 333,384.58/705.25
  6. Step 6: Final answer
    x = 472.72

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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.