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Finding the Fourth Proportional to 857.18, 1,285.75 and 240.93

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Solution

The fourth proportional to 857.18, 1,285.75 and 240.93 is: 361.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.18 : 1,285.75 = 240.93 : x
  2. Step 2: Convert to fraction form
    857.18/1,285.75 = 240.93/x
  3. Step 3: Cross multiply
    857.18x = 1,285.75 × 240.93
  4. Step 4: Simplify right side
    857.18x = 309,775.75
  5. Step 5: Solve for x
    x = 309,775.75/857.18
  6. Step 6: Final answer
    x = 361.39

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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.