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Finding the Fourth Proportional to 947.00, 1,420.69 and 399.18

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Solution

The fourth proportional to 947.00, 1,420.69 and 399.18 is: 598.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.00 : 1,420.69 = 399.18 : x
  2. Step 2: Convert to fraction form
    947.00/1,420.69 = 399.18/x
  3. Step 3: Cross multiply
    947.00x = 1,420.69 × 399.18
  4. Step 4: Simplify right side
    947.00x = 567,107.37
  5. Step 5: Solve for x
    x = 567,107.37/947.00
  6. Step 6: Final answer
    x = 598.85

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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.