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Finding the Fourth Proportional to 684.79, 938.89 and 672.46

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Solution

The fourth proportional to 684.79, 938.89 and 672.46 is: 921.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.79 : 938.89 = 672.46 : x
  2. Step 2: Convert to fraction form
    684.79/938.89 = 672.46/x
  3. Step 3: Cross multiply
    684.79x = 938.89 × 672.46
  4. Step 4: Simplify right side
    684.79x = 631,365.97
  5. Step 5: Solve for x
    x = 631,365.97/684.79
  6. Step 6: Final answer
    x = 921.98

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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.