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Finding the Fourth Proportional to 936.69, 1,292.41 and 687.58

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Solution

The fourth proportional to 936.69, 1,292.41 and 687.58 is: 948.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.69 : 1,292.41 = 687.58 : x
  2. Step 2: Convert to fraction form
    936.69/1,292.41 = 687.58/x
  3. Step 3: Cross multiply
    936.69x = 1,292.41 × 687.58
  4. Step 4: Simplify right side
    936.69x = 888,635.27
  5. Step 5: Solve for x
    x = 888,635.27/936.69
  6. Step 6: Final answer
    x = 948.70

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1.5x scale

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.