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Finding the Fourth Proportional to 706.23, 974.64 and 391.51

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Solution

The fourth proportional to 706.23, 974.64 and 391.51 is: 540.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    706.23 : 974.64 = 391.51 : x
  2. Step 2: Convert to fraction form
    706.23/974.64 = 391.51/x
  3. Step 3: Cross multiply
    706.23x = 974.64 × 391.51
  4. Step 4: Simplify right side
    706.23x = 381,581.31
  5. Step 5: Solve for x
    x = 381,581.31/706.23
  6. Step 6: Final answer
    x = 540.31

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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.