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Finding the Fourth Proportional to 684.37, 1,026.42 and 319.15

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Solution

The fourth proportional to 684.37, 1,026.42 and 319.15 is: 478.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.37 : 1,026.42 = 319.15 : x
  2. Step 2: Convert to fraction form
    684.37/1,026.42 = 319.15/x
  3. Step 3: Cross multiply
    684.37x = 1,026.42 × 319.15
  4. Step 4: Simplify right side
    684.37x = 327,581.94
  5. Step 5: Solve for x
    x = 327,581.94/684.37
  6. Step 6: Final answer
    x = 478.66

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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.