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Finding the Fourth Proportional to 684.32, 938.80 and 672.80

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Solution

The fourth proportional to 684.32, 938.80 and 672.80 is: 923.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.32 : 938.80 = 672.80 : x
  2. Step 2: Convert to fraction form
    684.32/938.80 = 672.80/x
  3. Step 3: Cross multiply
    684.32x = 938.80 × 672.80
  4. Step 4: Simplify right side
    684.32x = 631,624.64
  5. Step 5: Solve for x
    x = 631,624.64/684.32
  6. Step 6: Final answer
    x = 923.00

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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.