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Finding the Fourth Proportional to 151.47, 228.42 and 138.51

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Solution

The fourth proportional to 151.47, 228.42 and 138.51 is: 208.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.47 : 228.42 = 138.51 : x
  2. Step 2: Convert to fraction form
    151.47/228.42 = 138.51/x
  3. Step 3: Cross multiply
    151.47x = 228.42 × 138.51
  4. Step 4: Simplify right side
    151.47x = 31,638.45
  5. Step 5: Solve for x
    x = 31,638.45/151.47
  6. Step 6: Final answer
    x = 208.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.