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Finding the Fourth Proportional to 1,331.76, 1,997.68 and 561.76

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Solution

The fourth proportional to 1,331.76, 1,997.68 and 561.76 is: 842.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.76 : 1,997.68 = 561.76 : x
  2. Step 2: Convert to fraction form
    1,331.76/1,997.68 = 561.76/x
  3. Step 3: Cross multiply
    1,331.76x = 1,997.68 × 561.76
  4. Step 4: Simplify right side
    1,331.76x = 1,122,216.72
  5. Step 5: Solve for x
    x = 1,122,216.72/1,331.76
  6. Step 6: Final answer
    x = 842.66

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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.