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Finding the Fourth Proportional to 368.82, 508.95 and 221.40

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Solution

The fourth proportional to 368.82, 508.95 and 221.40 is: 305.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.82 : 508.95 = 221.40 : x
  2. Step 2: Convert to fraction form
    368.82/508.95 = 221.40/x
  3. Step 3: Cross multiply
    368.82x = 508.95 × 221.40
  4. Step 4: Simplify right side
    368.82x = 112,681.53
  5. Step 5: Solve for x
    x = 112,681.53/368.82
  6. Step 6: Final answer
    x = 305.52

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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.