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Finding the Fourth Proportional to 403.13, 605.07 and 257.18

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Solution

The fourth proportional to 403.13, 605.07 and 257.18 is: 386.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.13 : 605.07 = 257.18 : x
  2. Step 2: Convert to fraction form
    403.13/605.07 = 257.18/x
  3. Step 3: Cross multiply
    403.13x = 605.07 × 257.18
  4. Step 4: Simplify right side
    403.13x = 155,608.88
  5. Step 5: Solve for x
    x = 155,608.88/403.13
  6. Step 6: Final answer
    x = 386.00

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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.