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Finding the Fourth Proportional to 395.78, 545.93 and 285.08

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Solution

The fourth proportional to 395.78, 545.93 and 285.08 is: 393.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.78 : 545.93 = 285.08 : x
  2. Step 2: Convert to fraction form
    395.78/545.93 = 285.08/x
  3. Step 3: Cross multiply
    395.78x = 545.93 × 285.08
  4. Step 4: Simplify right side
    395.78x = 155,633.72
  5. Step 5: Solve for x
    x = 155,633.72/395.78
  6. Step 6: Final answer
    x = 393.23

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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.