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Finding the Fourth Proportional to 1,131.20, 1,561.19 and 689.16

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Solution

The fourth proportional to 1,131.20, 1,561.19 and 689.16 is: 951.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.20 : 1,561.19 = 689.16 : x
  2. Step 2: Convert to fraction form
    1,131.20/1,561.19 = 689.16/x
  3. Step 3: Cross multiply
    1,131.20x = 1,561.19 × 689.16
  4. Step 4: Simplify right side
    1,131.20x = 1,075,906.25
  5. Step 5: Solve for x
    x = 1,075,906.25/1,131.20
  6. Step 6: Final answer
    x = 951.12

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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.