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Finding the Fourth Proportional to 684.40, 944.48 and 389.68

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Solution

The fourth proportional to 684.40, 944.48 and 389.68 is: 537.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.40 : 944.48 = 389.68 : x
  2. Step 2: Convert to fraction form
    684.40/944.48 = 389.68/x
  3. Step 3: Cross multiply
    684.40x = 944.48 × 389.68
  4. Step 4: Simplify right side
    684.40x = 368,044.97
  5. Step 5: Solve for x
    x = 368,044.97/684.40
  6. Step 6: Final answer
    x = 537.76

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.