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Finding the Fourth Proportional to 935.04, 1,288.96 and 685.76

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Solution

The fourth proportional to 935.04, 1,288.96 and 685.76 is: 945.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.04 : 1,288.96 = 685.76 : x
  2. Step 2: Convert to fraction form
    935.04/1,288.96 = 685.76/x
  3. Step 3: Cross multiply
    935.04x = 1,288.96 × 685.76
  4. Step 4: Simplify right side
    935.04x = 883,917.21
  5. Step 5: Solve for x
    x = 883,917.21/935.04
  6. Step 6: Final answer
    x = 945.33

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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.