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Finding the Fourth Proportional to 165.64, 228.60 and 100.15

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Solution

The fourth proportional to 165.64, 228.60 and 100.15 is: 138.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.64 : 228.60 = 100.15 : x
  2. Step 2: Convert to fraction form
    165.64/228.60 = 100.15/x
  3. Step 3: Cross multiply
    165.64x = 228.60 × 100.15
  4. Step 4: Simplify right side
    165.64x = 22,894.29
  5. Step 5: Solve for x
    x = 22,894.29/165.64
  6. Step 6: Final answer
    x = 138.22

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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.