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Finding the Fourth Proportional to 1,359.56, 2,039.29 and 385.66

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Solution

The fourth proportional to 1,359.56, 2,039.29 and 385.66 is: 578.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359.56 : 2,039.29 = 385.66 : x
  2. Step 2: Convert to fraction form
    1,359.56/2,039.29 = 385.66/x
  3. Step 3: Cross multiply
    1,359.56x = 2,039.29 × 385.66
  4. Step 4: Simplify right side
    1,359.56x = 786,472.58
  5. Step 5: Solve for x
    x = 786,472.58/1,359.56
  6. Step 6: Final answer
    x = 578.48

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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.