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Finding the Fourth Proportional to 368.88, 553.20 and 125.40

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Solution

The fourth proportional to 368.88, 553.20 and 125.40 is: 188.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.88 : 553.20 = 125.40 : x
  2. Step 2: Convert to fraction form
    368.88/553.20 = 125.40/x
  3. Step 3: Cross multiply
    368.88x = 553.20 × 125.40
  4. Step 4: Simplify right side
    368.88x = 69,371.28
  5. Step 5: Solve for x
    x = 69,371.28/368.88
  6. Step 6: Final answer
    x = 188.06

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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.