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Finding the Fourth Proportional to 1,153.40, 1,591.56 and 687.56

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Solution

The fourth proportional to 1,153.40, 1,591.56 and 687.56 is: 948.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.40 : 1,591.56 = 687.56 : x
  2. Step 2: Convert to fraction form
    1,153.40/1,591.56 = 687.56/x
  3. Step 3: Cross multiply
    1,153.40x = 1,591.56 × 687.56
  4. Step 4: Simplify right side
    1,153.40x = 1,094,292.99
  5. Step 5: Solve for x
    x = 1,094,292.99/1,153.40
  6. Step 6: Final answer
    x = 948.75

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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.