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Finding the Fourth Proportional to 1,539.63, 2,309.45 and 385.38

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Solution

The fourth proportional to 1,539.63, 2,309.45 and 385.38 is: 578.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.63 : 2,309.45 = 385.38 : x
  2. Step 2: Convert to fraction form
    1,539.63/2,309.45 = 385.38/x
  3. Step 3: Cross multiply
    1,539.63x = 2,309.45 × 385.38
  4. Step 4: Simplify right side
    1,539.63x = 890,015.84
  5. Step 5: Solve for x
    x = 890,015.84/1,539.63
  6. Step 6: Final answer
    x = 578.07

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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.