Home / 1,285.86-1,930.96-1,220.10

Finding the Fourth Proportional to 1,285.86, 1,930.96 and 1,220.10

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Solution

The fourth proportional to 1,285.86, 1,930.96 and 1,220.10 is: 1,832.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.86 : 1,930.96 = 1,220.10 : x
  2. Step 2: Convert to fraction form
    1,285.86/1,930.96 = 1,220.10/x
  3. Step 3: Cross multiply
    1,285.86x = 1,930.96 × 1,220.10
  4. Step 4: Simplify right side
    1,285.86x = 2,355,964.30
  5. Step 5: Solve for x
    x = 2,355,964.30/1,285.86
  6. Step 6: Final answer
    x = 1,832.21

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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.