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Finding the Fourth Proportional to 145.62, 201.28 and 121.46

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Solution

The fourth proportional to 145.62, 201.28 and 121.46 is: 167.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.62 : 201.28 = 121.46 : x
  2. Step 2: Convert to fraction form
    145.62/201.28 = 121.46/x
  3. Step 3: Cross multiply
    145.62x = 201.28 × 121.46
  4. Step 4: Simplify right side
    145.62x = 24,447.47
  5. Step 5: Solve for x
    x = 24,447.47/145.62
  6. Step 6: Final answer
    x = 167.89

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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.