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Finding the Fourth Proportional to 394.89, 545.40 and 254.99

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Solution

The fourth proportional to 394.89, 545.40 and 254.99 is: 352.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.89 : 545.40 = 254.99 : x
  2. Step 2: Convert to fraction form
    394.89/545.40 = 254.99/x
  3. Step 3: Cross multiply
    394.89x = 545.40 × 254.99
  4. Step 4: Simplify right side
    394.89x = 139,068.82
  5. Step 5: Solve for x
    x = 139,068.82/394.89
  6. Step 6: Final answer
    x = 352.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.