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Finding the Fourth Proportional to 935.97, 1,291.78 and 687.16

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Solution

The fourth proportional to 935.97, 1,291.78 and 687.16 is: 948.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.97 : 1,291.78 = 687.16 : x
  2. Step 2: Convert to fraction form
    935.97/1,291.78 = 687.16/x
  3. Step 3: Cross multiply
    935.97x = 1,291.78 × 687.16
  4. Step 4: Simplify right side
    935.97x = 887,659.54
  5. Step 5: Solve for x
    x = 887,659.54/935.97
  6. Step 6: Final answer
    x = 948.38

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Double scale
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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.