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Finding the Fourth Proportional to 1,539.74, 2,309.61 and 385.49

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Solution

The fourth proportional to 1,539.74, 2,309.61 and 385.49 is: 578.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.74 : 2,309.61 = 385.49 : x
  2. Step 2: Convert to fraction form
    1,539.74/2,309.61 = 385.49/x
  3. Step 3: Cross multiply
    1,539.74x = 2,309.61 × 385.49
  4. Step 4: Simplify right side
    1,539.74x = 890,331.56
  5. Step 5: Solve for x
    x = 890,331.56/1,539.74
  6. Step 6: Final answer
    x = 578.24

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1.5x scale

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.