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Finding the Fourth Proportional to 682.75, 1,024.47 and 317.49

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Solution

The fourth proportional to 682.75, 1,024.47 and 317.49 is: 476.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.75 : 1,024.47 = 317.49 : x
  2. Step 2: Convert to fraction form
    682.75/1,024.47 = 317.49/x
  3. Step 3: Cross multiply
    682.75x = 1,024.47 × 317.49
  4. Step 4: Simplify right side
    682.75x = 325,264.68
  5. Step 5: Solve for x
    x = 325,264.68/682.75
  6. Step 6: Final answer
    x = 476.40

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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.