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Finding the Fourth Proportional to 368.50, 508.39 and 221.08

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Solution

The fourth proportional to 368.50, 508.39 and 221.08 is: 305.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.50 : 508.39 = 221.08 : x
  2. Step 2: Convert to fraction form
    368.50/508.39 = 221.08/x
  3. Step 3: Cross multiply
    368.50x = 508.39 × 221.08
  4. Step 4: Simplify right side
    368.50x = 112,394.86
  5. Step 5: Solve for x
    x = 112,394.86/368.50
  6. Step 6: Final answer
    x = 305.01

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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.