Home / 1,285.86-1,929.18-545.09

Finding the Fourth Proportional to 1,285.86, 1,929.18 and 545.09

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Solution

The fourth proportional to 1,285.86, 1,929.18 and 545.09 is: 817.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.86 : 1,929.18 = 545.09 : x
  2. Step 2: Convert to fraction form
    1,285.86/1,929.18 = 545.09/x
  3. Step 3: Cross multiply
    1,285.86x = 1,929.18 × 545.09
  4. Step 4: Simplify right side
    1,285.86x = 1,051,567.08
  5. Step 5: Solve for x
    x = 1,051,567.08/1,285.86
  6. Step 6: Final answer
    x = 817.79

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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.