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Finding the Fourth Proportional to 368.62, 508.71 and 221.35

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Solution

The fourth proportional to 368.62, 508.71 and 221.35 is: 305.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.62 : 508.71 = 221.35 : x
  2. Step 2: Convert to fraction form
    368.62/508.71 = 221.35/x
  3. Step 3: Cross multiply
    368.62x = 508.71 × 221.35
  4. Step 4: Simplify right side
    368.62x = 112,602.96
  5. Step 5: Solve for x
    x = 112,602.96/368.62
  6. Step 6: Final answer
    x = 305.47

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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.