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Finding the Fourth Proportional to 682.12, 939.63 and 571.54

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Solution

The fourth proportional to 682.12, 939.63 and 571.54 is: 787.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.12 : 939.63 = 571.54 : x
  2. Step 2: Convert to fraction form
    682.12/939.63 = 571.54/x
  3. Step 3: Cross multiply
    682.12x = 939.63 × 571.54
  4. Step 4: Simplify right side
    682.12x = 537,036.13
  5. Step 5: Solve for x
    x = 537,036.13/682.12
  6. Step 6: Final answer
    x = 787.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.