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Finding the Fourth Proportional to 936.90, 1,292.77 and 558.74

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Solution

The fourth proportional to 936.90, 1,292.77 and 558.74 is: 770.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.90 : 1,292.77 = 558.74 : x
  2. Step 2: Convert to fraction form
    936.90/1,292.77 = 558.74/x
  3. Step 3: Cross multiply
    936.90x = 1,292.77 × 558.74
  4. Step 4: Simplify right side
    936.90x = 722,322.31
  5. Step 5: Solve for x
    x = 722,322.31/936.90
  6. Step 6: Final answer
    x = 770.97

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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.