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Finding the Fourth Proportional to 1,359.89, 2,040.19 and 386.07

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Solution

The fourth proportional to 1,359.89, 2,040.19 and 386.07 is: 579.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,359.89 : 2,040.19 = 386.07 : x
  2. Step 2: Convert to fraction form
    1,359.89/2,040.19 = 386.07/x
  3. Step 3: Cross multiply
    1,359.89x = 2,040.19 × 386.07
  4. Step 4: Simplify right side
    1,359.89x = 787,647.54
  5. Step 5: Solve for x
    x = 787,647.54/1,359.89
  6. Step 6: Final answer
    x = 579.20

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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.