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Finding the Fourth Proportional to 3,579.87, 5,368.90 and 1,387.40

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Solution

The fourth proportional to 3,579.87, 5,368.90 and 1,387.40 is: 2,080.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,579.87 : 5,368.90 = 1,387.40 : x
  2. Step 2: Convert to fraction form
    3,579.87/5,368.90 = 1,387.40/x
  3. Step 3: Cross multiply
    3,579.87x = 5,368.90 × 1,387.40
  4. Step 4: Simplify right side
    3,579.87x = 7,448,811.86
  5. Step 5: Solve for x
    x = 7,448,811.86/3,579.87
  6. Step 6: Final answer
    x = 2,080.75

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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.