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Finding the Fourth Proportional to 712.86, 1,069.63 and 388.22

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Solution

The fourth proportional to 712.86, 1,069.63 and 388.22 is: 582.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.86 : 1,069.63 = 388.22 : x
  2. Step 2: Convert to fraction form
    712.86/1,069.63 = 388.22/x
  3. Step 3: Cross multiply
    712.86x = 1,069.63 × 388.22
  4. Step 4: Simplify right side
    712.86x = 415,251.76
  5. Step 5: Solve for x
    x = 415,251.76/712.86
  6. Step 6: Final answer
    x = 582.52

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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.