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Finding the Fourth Proportional to 935.76, 1,293.12 and 687.36

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Solution

The fourth proportional to 935.76, 1,293.12 and 687.36 is: 949.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.76 : 1,293.12 = 687.36 : x
  2. Step 2: Convert to fraction form
    935.76/1,293.12 = 687.36/x
  3. Step 3: Cross multiply
    935.76x = 1,293.12 × 687.36
  4. Step 4: Simplify right side
    935.76x = 888,838.96
  5. Step 5: Solve for x
    x = 888,838.96/935.76
  6. Step 6: Final answer
    x = 949.86

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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.