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Finding the Fourth Proportional to 280.51, 420.64 and 107.21

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Solution

The fourth proportional to 280.51, 420.64 and 107.21 is: 160.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.51 : 420.64 = 107.21 : x
  2. Step 2: Convert to fraction form
    280.51/420.64 = 107.21/x
  3. Step 3: Cross multiply
    280.51x = 420.64 × 107.21
  4. Step 4: Simplify right side
    280.51x = 45,097.60
  5. Step 5: Solve for x
    x = 45,097.60/280.51
  6. Step 6: Final answer
    x = 160.77

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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.