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Finding the Fourth Proportional to 1,269.17, 1,902.81 and 857.15

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Solution

The fourth proportional to 1,269.17, 1,902.81 and 857.15 is: 1,285.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.17 : 1,902.81 = 857.15 : x
  2. Step 2: Convert to fraction form
    1,269.17/1,902.81 = 857.15/x
  3. Step 3: Cross multiply
    1,269.17x = 1,902.81 × 857.15
  4. Step 4: Simplify right side
    1,269.17x = 1,630,993.59
  5. Step 5: Solve for x
    x = 1,630,993.59/1,269.17
  6. Step 6: Final answer
    x = 1,285.09

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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.