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Finding the Fourth Proportional to 705.71, 1,058.57 and 320.69

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Solution

The fourth proportional to 705.71, 1,058.57 and 320.69 is: 481.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.71 : 1,058.57 = 320.69 : x
  2. Step 2: Convert to fraction form
    705.71/1,058.57 = 320.69/x
  3. Step 3: Cross multiply
    705.71x = 1,058.57 × 320.69
  4. Step 4: Simplify right side
    705.71x = 339,472.81
  5. Step 5: Solve for x
    x = 339,472.81/705.71
  6. Step 6: Final answer
    x = 481.04

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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.