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Finding the Fourth Proportional to 1,131.09, 1,560.70 and 689.12

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Solution

The fourth proportional to 1,131.09, 1,560.70 and 689.12 is: 950.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.09 : 1,560.70 = 689.12 : x
  2. Step 2: Convert to fraction form
    1,131.09/1,560.70 = 689.12/x
  3. Step 3: Cross multiply
    1,131.09x = 1,560.70 × 689.12
  4. Step 4: Simplify right side
    1,131.09x = 1,075,509.58
  5. Step 5: Solve for x
    x = 1,075,509.58/1,131.09
  6. Step 6: Final answer
    x = 950.86

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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.