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Finding the Fourth Proportional to 1,150, 1,587.40 and 684.26

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Solution

The fourth proportional to 1,150, 1,587.40 and 684.26 is: 944.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,150 : 1,587.40 = 684.26 : x
  2. Step 2: Convert to fraction form
    1,150/1,587.40 = 684.26/x
  3. Step 3: Cross multiply
    1,150x = 1,587.40 × 684.26
  4. Step 4: Simplify right side
    1,150x = 1,086,194.32
  5. Step 5: Solve for x
    x = 1,086,194.32/1,150
  6. Step 6: Final answer
    x = 944.52

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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.