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Finding the Fourth Proportional to 368.72, 508.72 and 221.30

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Solution

The fourth proportional to 368.72, 508.72 and 221.30 is: 305.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.72 : 508.72 = 221.30 : x
  2. Step 2: Convert to fraction form
    368.72/508.72 = 221.30/x
  3. Step 3: Cross multiply
    368.72x = 508.72 × 221.30
  4. Step 4: Simplify right side
    368.72x = 112,579.74
  5. Step 5: Solve for x
    x = 112,579.74/368.72
  6. Step 6: Final answer
    x = 305.33

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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.