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Finding the Fourth Proportional to 368.63, 508.64 and 221.30

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Solution

The fourth proportional to 368.63, 508.64 and 221.30 is: 305.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.63 : 508.64 = 221.30 : x
  2. Step 2: Convert to fraction form
    368.63/508.64 = 221.30/x
  3. Step 3: Cross multiply
    368.63x = 508.64 × 221.30
  4. Step 4: Simplify right side
    368.63x = 112,558.38
  5. Step 5: Solve for x
    x = 112,558.38/368.63
  6. Step 6: Final answer
    x = 305.35

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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.