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Finding the Fourth Proportional to 1,129.75, 1,559.22 and 657.80

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Solution

The fourth proportional to 1,129.75, 1,559.22 and 657.80 is: 907.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.75 : 1,559.22 = 657.80 : x
  2. Step 2: Convert to fraction form
    1,129.75/1,559.22 = 657.80/x
  3. Step 3: Cross multiply
    1,129.75x = 1,559.22 × 657.80
  4. Step 4: Simplify right side
    1,129.75x = 1,025,658.81
  5. Step 5: Solve for x
    x = 1,025,658.81/1,129.75
  6. Step 6: Final answer
    x = 907.87

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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.