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Finding the Fourth Proportional to 1,039.87, 1,558.99 and 390.25

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Solution

The fourth proportional to 1,039.87, 1,558.99 and 390.25 is: 585.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.87 : 1,558.99 = 390.25 : x
  2. Step 2: Convert to fraction form
    1,039.87/1,558.99 = 390.25/x
  3. Step 3: Cross multiply
    1,039.87x = 1,558.99 × 390.25
  4. Step 4: Simplify right side
    1,039.87x = 608,395.85
  5. Step 5: Solve for x
    x = 608,395.85/1,039.87
  6. Step 6: Final answer
    x = 585.07

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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.