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Finding the Fourth Proportional to 716.86, 1,074.75 and 392.05

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Solution

The fourth proportional to 716.86, 1,074.75 and 392.05 is: 587.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.86 : 1,074.75 = 392.05 : x
  2. Step 2: Convert to fraction form
    716.86/1,074.75 = 392.05/x
  3. Step 3: Cross multiply
    716.86x = 1,074.75 × 392.05
  4. Step 4: Simplify right side
    716.86x = 421,355.74
  5. Step 5: Solve for x
    x = 421,355.74/716.86
  6. Step 6: Final answer
    x = 587.78

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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.