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Finding the Fourth Proportional to 165.11, 228.12 and 130.40

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Solution

The fourth proportional to 165.11, 228.12 and 130.40 is: 180.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.11 : 228.12 = 130.40 : x
  2. Step 2: Convert to fraction form
    165.11/228.12 = 130.40/x
  3. Step 3: Cross multiply
    165.11x = 228.12 × 130.40
  4. Step 4: Simplify right side
    165.11x = 29,745.71
  5. Step 5: Solve for x
    x = 29,745.71/165.11
  6. Step 6: Final answer
    x = 180.16

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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.