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Finding the Fourth Proportional to 368.81, 553.01 and 253.28

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Solution

The fourth proportional to 368.81, 553.01 and 253.28 is: 379.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.81 : 553.01 = 253.28 : x
  2. Step 2: Convert to fraction form
    368.81/553.01 = 253.28/x
  3. Step 3: Cross multiply
    368.81x = 553.01 × 253.28
  4. Step 4: Simplify right side
    368.81x = 140,065.11
  5. Step 5: Solve for x
    x = 140,065.11/368.81
  6. Step 6: Final answer
    x = 379.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.