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Finding the Fourth Proportional to 280.77, 420.97 and 143.71

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Solution

The fourth proportional to 280.77, 420.97 and 143.71 is: 215.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.77 : 420.97 = 143.71 : x
  2. Step 2: Convert to fraction form
    280.77/420.97 = 143.71/x
  3. Step 3: Cross multiply
    280.77x = 420.97 × 143.71
  4. Step 4: Simplify right side
    280.77x = 60,496.19
  5. Step 5: Solve for x
    x = 60,496.19/280.77
  6. Step 6: Final answer
    x = 215.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.