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Finding the Fourth Proportional to 1,359.88, 2,039.64 and 386.05

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Solution

The fourth proportional to 1,359.88, 2,039.64 and 386.05 is: 579.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359.88 : 2,039.64 = 386.05 : x
  2. Step 2: Convert to fraction form
    1,359.88/2,039.64 = 386.05/x
  3. Step 3: Cross multiply
    1,359.88x = 2,039.64 × 386.05
  4. Step 4: Simplify right side
    1,359.88x = 787,403.02
  5. Step 5: Solve for x
    x = 787,403.02/1,359.88
  6. Step 6: Final answer
    x = 579.02

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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.