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Finding the Fourth Proportional to 1,121.13, 1,679.58 and 573.66

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Solution

The fourth proportional to 1,121.13, 1,679.58 and 573.66 is: 859.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.13 : 1,679.58 = 573.66 : x
  2. Step 2: Convert to fraction form
    1,121.13/1,679.58 = 573.66/x
  3. Step 3: Cross multiply
    1,121.13x = 1,679.58 × 573.66
  4. Step 4: Simplify right side
    1,121.13x = 963,507.86
  5. Step 5: Solve for x
    x = 963,507.86/1,121.13
  6. Step 6: Final answer
    x = 859.41

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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.