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Finding the Fourth Proportional to 1,539.86, 2,309.76 and 385.62

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Solution

The fourth proportional to 1,539.86, 2,309.76 and 385.62 is: 578.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.86 : 2,309.76 = 385.62 : x
  2. Step 2: Convert to fraction form
    1,539.86/2,309.76 = 385.62/x
  3. Step 3: Cross multiply
    1,539.86x = 2,309.76 × 385.62
  4. Step 4: Simplify right side
    1,539.86x = 890,689.65
  5. Step 5: Solve for x
    x = 890,689.65/1,539.86
  6. Step 6: Final answer
    x = 578.42

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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.