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Finding the Fourth Proportional to 1,359.38, 2,038.64 and 385.22

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Solution

The fourth proportional to 1,359.38, 2,038.64 and 385.22 is: 577.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359.38 : 2,038.64 = 385.22 : x
  2. Step 2: Convert to fraction form
    1,359.38/2,038.64 = 385.22/x
  3. Step 3: Cross multiply
    1,359.38x = 2,038.64 × 385.22
  4. Step 4: Simplify right side
    1,359.38x = 785,328.07
  5. Step 5: Solve for x
    x = 785,328.07/1,359.38
  6. Step 6: Final answer
    x = 577.71

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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.