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Finding the Fourth Proportional to 368.18, 507.90 and 220.78

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Solution

The fourth proportional to 368.18, 507.90 and 220.78 is: 304.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.18 : 507.90 = 220.78 : x
  2. Step 2: Convert to fraction form
    368.18/507.90 = 220.78/x
  3. Step 3: Cross multiply
    368.18x = 507.90 × 220.78
  4. Step 4: Simplify right side
    368.18x = 112,134.16
  5. Step 5: Solve for x
    x = 112,134.16/368.18
  6. Step 6: Final answer
    x = 304.56

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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.