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Finding the Fourth Proportional to 280.05, 386.46 and 154.01

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Solution

The fourth proportional to 280.05, 386.46 and 154.01 is: 212.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.05 : 386.46 = 154.01 : x
  2. Step 2: Convert to fraction form
    280.05/386.46 = 154.01/x
  3. Step 3: Cross multiply
    280.05x = 386.46 × 154.01
  4. Step 4: Simplify right side
    280.05x = 59,516.77
  5. Step 5: Solve for x
    x = 59,516.77/280.05
  6. Step 6: Final answer
    x = 212.52

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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.