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Finding the Fourth Proportional to 684.21, 1,025.40 and 376.14

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Solution

The fourth proportional to 684.21, 1,025.40 and 376.14 is: 563.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.21 : 1,025.40 = 376.14 : x
  2. Step 2: Convert to fraction form
    684.21/1,025.40 = 376.14/x
  3. Step 3: Cross multiply
    684.21x = 1,025.40 × 376.14
  4. Step 4: Simplify right side
    684.21x = 385,693.96
  5. Step 5: Solve for x
    x = 385,693.96/684.21
  6. Step 6: Final answer
    x = 563.71

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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.