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Finding the Fourth Proportional to 165.40, 228.42 and 156.76

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Solution

The fourth proportional to 165.40, 228.42 and 156.76 is: 216.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.40 : 228.42 = 156.76 : x
  2. Step 2: Convert to fraction form
    165.40/228.42 = 156.76/x
  3. Step 3: Cross multiply
    165.40x = 228.42 × 156.76
  4. Step 4: Simplify right side
    165.40x = 35,807.12
  5. Step 5: Solve for x
    x = 35,807.12/165.40
  6. Step 6: Final answer
    x = 216.49

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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.