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Finding the Fourth Proportional to 684.18, 1,025.81 and 392.01

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Solution

The fourth proportional to 684.18, 1,025.81 and 392.01 is: 587.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.18 : 1,025.81 = 392.01 : x
  2. Step 2: Convert to fraction form
    684.18/1,025.81 = 392.01/x
  3. Step 3: Cross multiply
    684.18x = 1,025.81 × 392.01
  4. Step 4: Simplify right side
    684.18x = 402,125.82
  5. Step 5: Solve for x
    x = 402,125.82/684.18
  6. Step 6: Final answer
    x = 587.75

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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.