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Finding the Fourth Proportional to 1,586.05, 2,379.32 and 545.79

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Solution

The fourth proportional to 1,586.05, 2,379.32 and 545.79 is: 818.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.05 : 2,379.32 = 545.79 : x
  2. Step 2: Convert to fraction form
    1,586.05/2,379.32 = 545.79/x
  3. Step 3: Cross multiply
    1,586.05x = 2,379.32 × 545.79
  4. Step 4: Simplify right side
    1,586.05x = 1,298,620.37
  5. Step 5: Solve for x
    x = 1,298,620.37/1,586.05
  6. Step 6: Final answer
    x = 818.78

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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.