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Finding the Fourth Proportional to 684.68, 938.69 and 672.37

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Solution

The fourth proportional to 684.68, 938.69 and 672.37 is: 921.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.68 : 938.69 = 672.37 : x
  2. Step 2: Convert to fraction form
    684.68/938.69 = 672.37/x
  3. Step 3: Cross multiply
    684.68x = 938.69 × 672.37
  4. Step 4: Simplify right side
    684.68x = 631,141.29
  5. Step 5: Solve for x
    x = 631,141.29/684.68
  6. Step 6: Final answer
    x = 921.81

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.