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Finding the Fourth Proportional to 857.22, 1,285.72 and 240.98

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Solution

The fourth proportional to 857.22, 1,285.72 and 240.98 is: 361.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.22 : 1,285.72 = 240.98 : x
  2. Step 2: Convert to fraction form
    857.22/1,285.72 = 240.98/x
  3. Step 3: Cross multiply
    857.22x = 1,285.72 × 240.98
  4. Step 4: Simplify right side
    857.22x = 309,827.13
  5. Step 5: Solve for x
    x = 309,827.13/857.22
  6. Step 6: Final answer
    x = 361.43

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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.