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Finding the Fourth Proportional to 1,539.53, 2,309.28 and 385.28

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Solution

The fourth proportional to 1,539.53, 2,309.28 and 385.28 is: 577.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.53 : 2,309.28 = 385.28 : x
  2. Step 2: Convert to fraction form
    1,539.53/2,309.28 = 385.28/x
  3. Step 3: Cross multiply
    1,539.53x = 2,309.28 × 385.28
  4. Step 4: Simplify right side
    1,539.53x = 889,707.85
  5. Step 5: Solve for x
    x = 889,707.85/1,539.53
  6. Step 6: Final answer
    x = 577.91

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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.