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Finding the Fourth Proportional to 935.56, 1,291.38 and 687.40

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Solution

The fourth proportional to 935.56, 1,291.38 and 687.40 is: 948.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.56 : 1,291.38 = 687.40 : x
  2. Step 2: Convert to fraction form
    935.56/1,291.38 = 687.40/x
  3. Step 3: Cross multiply
    935.56x = 1,291.38 × 687.40
  4. Step 4: Simplify right side
    935.56x = 887,694.61
  5. Step 5: Solve for x
    x = 887,694.61/935.56
  6. Step 6: Final answer
    x = 948.84

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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.