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Finding the Fourth Proportional to 1,159.57, 1,599.91 and 687.48

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Solution

The fourth proportional to 1,159.57, 1,599.91 and 687.48 is: 948.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159.57 : 1,599.91 = 687.48 : x
  2. Step 2: Convert to fraction form
    1,159.57/1,599.91 = 687.48/x
  3. Step 3: Cross multiply
    1,159.57x = 1,599.91 × 687.48
  4. Step 4: Simplify right side
    1,159.57x = 1,099,906.13
  5. Step 5: Solve for x
    x = 1,099,906.13/1,159.57
  6. Step 6: Final answer
    x = 948.55

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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.