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Finding the Fourth Proportional to 1,351.15, 1,866.35 and 930.78

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Solution

The fourth proportional to 1,351.15, 1,866.35 and 930.78 is: 1,285.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.15 : 1,866.35 = 930.78 : x
  2. Step 2: Convert to fraction form
    1,351.15/1,866.35 = 930.78/x
  3. Step 3: Cross multiply
    1,351.15x = 1,866.35 × 930.78
  4. Step 4: Simplify right side
    1,351.15x = 1,737,163.58
  5. Step 5: Solve for x
    x = 1,737,163.58/1,351.15
  6. Step 6: Final answer
    x = 1,285.69

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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.