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Finding the Fourth Proportional to 1,131.71, 1,561.75 and 689.58

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Solution

The fourth proportional to 1,131.71, 1,561.75 and 689.58 is: 951.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.71 : 1,561.75 = 689.58 : x
  2. Step 2: Convert to fraction form
    1,131.71/1,561.75 = 689.58/x
  3. Step 3: Cross multiply
    1,131.71x = 1,561.75 × 689.58
  4. Step 4: Simplify right side
    1,131.71x = 1,076,949.84
  5. Step 5: Solve for x
    x = 1,076,949.84/1,131.71
  6. Step 6: Final answer
    x = 951.62

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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.