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Finding the Fourth Proportional to 684.87, 1,026.97 and 319.75

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Solution

The fourth proportional to 684.87, 1,026.97 and 319.75 is: 479.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.87 : 1,026.97 = 319.75 : x
  2. Step 2: Convert to fraction form
    684.87/1,026.97 = 319.75/x
  3. Step 3: Cross multiply
    684.87x = 1,026.97 × 319.75
  4. Step 4: Simplify right side
    684.87x = 328,373.66
  5. Step 5: Solve for x
    x = 328,373.66/684.87
  6. Step 6: Final answer
    x = 479.47

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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.