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Finding the Fourth Proportional to 1,047.87, 1,571.80 and 399.06

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Solution

The fourth proportional to 1,047.87, 1,571.80 and 399.06 is: 598.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.87 : 1,571.80 = 399.06 : x
  2. Step 2: Convert to fraction form
    1,047.87/1,571.80 = 399.06/x
  3. Step 3: Cross multiply
    1,047.87x = 1,571.80 × 399.06
  4. Step 4: Simplify right side
    1,047.87x = 627,234.65
  5. Step 5: Solve for x
    x = 627,234.65/1,047.87
  6. Step 6: Final answer
    x = 598.58

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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.