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Finding the Fourth Proportional to 684.18, 1,024.64 and 394.74

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Solution

The fourth proportional to 684.18, 1,024.64 and 394.74 is: 591.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.18 : 1,024.64 = 394.74 : x
  2. Step 2: Convert to fraction form
    684.18/1,024.64 = 394.74/x
  3. Step 3: Cross multiply
    684.18x = 1,024.64 × 394.74
  4. Step 4: Simplify right side
    684.18x = 404,464.42
  5. Step 5: Solve for x
    x = 404,464.42/684.18
  6. Step 6: Final answer
    x = 591.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.