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Finding the Fourth Proportional to 1,539.80, 2,309.70 and 385.55

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Solution

The fourth proportional to 1,539.80, 2,309.70 and 385.55 is: 578.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.80 : 2,309.70 = 385.55 : x
  2. Step 2: Convert to fraction form
    1,539.80/2,309.70 = 385.55/x
  3. Step 3: Cross multiply
    1,539.80x = 2,309.70 × 385.55
  4. Step 4: Simplify right side
    1,539.80x = 890,509.89
  5. Step 5: Solve for x
    x = 890,509.89/1,539.80
  6. Step 6: Final answer
    x = 578.33

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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.