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Finding the Fourth Proportional to 684.47, 938.43 and 672.19

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Solution

The fourth proportional to 684.47, 938.43 and 672.19 is: 921.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.47 : 938.43 = 672.19 : x
  2. Step 2: Convert to fraction form
    684.47/938.43 = 672.19/x
  3. Step 3: Cross multiply
    684.47x = 938.43 × 672.19
  4. Step 4: Simplify right side
    684.47x = 630,800.92
  5. Step 5: Solve for x
    x = 630,800.92/684.47
  6. Step 6: Final answer
    x = 921.59

Related Problems

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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.