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Finding the Fourth Proportional to 403.30, 605.04 and 143.31

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Solution

The fourth proportional to 403.30, 605.04 and 143.31 is: 215.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.30 : 605.04 = 143.31 : x
  2. Step 2: Convert to fraction form
    403.30/605.04 = 143.31/x
  3. Step 3: Cross multiply
    403.30x = 605.04 × 143.31
  4. Step 4: Simplify right side
    403.30x = 86,710.01
  5. Step 5: Solve for x
    x = 86,710.01/403.30
  6. Step 6: Final answer
    x = 215.00

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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.