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Finding the Fourth Proportional to 386.94, 533.94 and 221.10

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Solution

The fourth proportional to 386.94, 533.94 and 221.10 is: 305.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.94 : 533.94 = 221.10 : x
  2. Step 2: Convert to fraction form
    386.94/533.94 = 221.10/x
  3. Step 3: Cross multiply
    386.94x = 533.94 × 221.10
  4. Step 4: Simplify right side
    386.94x = 118,054.13
  5. Step 5: Solve for x
    x = 118,054.13/386.94
  6. Step 6: Final answer
    x = 305.10

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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.