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Finding the Fourth Proportional to 685.96, 946.12 and 663.36

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Solution

The fourth proportional to 685.96, 946.12 and 663.36 is: 914.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.96 : 946.12 = 663.36 : x
  2. Step 2: Convert to fraction form
    685.96/946.12 = 663.36/x
  3. Step 3: Cross multiply
    685.96x = 946.12 × 663.36
  4. Step 4: Simplify right side
    685.96x = 627,618.16
  5. Step 5: Solve for x
    x = 627,618.16/685.96
  6. Step 6: Final answer
    x = 914.95

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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.