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Finding the Fourth Proportional to 1,131.13, 1,560.78 and 633.79

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Solution

The fourth proportional to 1,131.13, 1,560.78 and 633.79 is: 874.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.13 : 1,560.78 = 633.79 : x
  2. Step 2: Convert to fraction form
    1,131.13/1,560.78 = 633.79/x
  3. Step 3: Cross multiply
    1,131.13x = 1,560.78 × 633.79
  4. Step 4: Simplify right side
    1,131.13x = 989,206.76
  5. Step 5: Solve for x
    x = 989,206.76/1,131.13
  6. Step 6: Final answer
    x = 874.53

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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.