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Finding the Fourth Proportional to 280.40, 420.67 and 164.94

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Solution

The fourth proportional to 280.40, 420.67 and 164.94 is: 247.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.40 : 420.67 = 164.94 : x
  2. Step 2: Convert to fraction form
    280.40/420.67 = 164.94/x
  3. Step 3: Cross multiply
    280.40x = 420.67 × 164.94
  4. Step 4: Simplify right side
    280.40x = 69,385.31
  5. Step 5: Solve for x
    x = 69,385.31/280.40
  6. Step 6: Final answer
    x = 247.45

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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.