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Finding the Fourth Proportional to 394.95, 543.93 and 386.45

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Solution

The fourth proportional to 394.95, 543.93 and 386.45 is: 532.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.95 : 543.93 = 386.45 : x
  2. Step 2: Convert to fraction form
    394.95/543.93 = 386.45/x
  3. Step 3: Cross multiply
    394.95x = 543.93 × 386.45
  4. Step 4: Simplify right side
    394.95x = 210,199.03
  5. Step 5: Solve for x
    x = 210,199.03/394.95
  6. Step 6: Final answer
    x = 532.22

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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.