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Finding the Fourth Proportional to 705.61, 1,057.67 and 315.79

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Solution

The fourth proportional to 705.61, 1,057.67 and 315.79 is: 473.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.61 : 1,057.67 = 315.79 : x
  2. Step 2: Convert to fraction form
    705.61/1,057.67 = 315.79/x
  3. Step 3: Cross multiply
    705.61x = 1,057.67 × 315.79
  4. Step 4: Simplify right side
    705.61x = 333,998.57
  5. Step 5: Solve for x
    x = 333,998.57/705.61
  6. Step 6: Final answer
    x = 473.35

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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.