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Finding the Fourth Proportional to 857.67, 1,178.43 and 682.71

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Solution

The fourth proportional to 857.67, 1,178.43 and 682.71 is: 938.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.67 : 1,178.43 = 682.71 : x
  2. Step 2: Convert to fraction form
    857.67/1,178.43 = 682.71/x
  3. Step 3: Cross multiply
    857.67x = 1,178.43 × 682.71
  4. Step 4: Simplify right side
    857.67x = 804,525.95
  5. Step 5: Solve for x
    x = 804,525.95/857.67
  6. Step 6: Final answer
    x = 938.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.