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Finding the Fourth Proportional to 684.65, 944.89 and 389.95

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Solution

The fourth proportional to 684.65, 944.89 and 389.95 is: 538.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.65 : 944.89 = 389.95 : x
  2. Step 2: Convert to fraction form
    684.65/944.89 = 389.95/x
  3. Step 3: Cross multiply
    684.65x = 944.89 × 389.95
  4. Step 4: Simplify right side
    684.65x = 368,456.52
  5. Step 5: Solve for x
    x = 368,456.52/684.65
  6. Step 6: Final answer
    x = 538.17

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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.