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Finding the Fourth Proportional to 280.66, 420.84 and 104.89

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Solution

The fourth proportional to 280.66, 420.84 and 104.89 is: 157.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.66 : 420.84 = 104.89 : x
  2. Step 2: Convert to fraction form
    280.66/420.84 = 104.89/x
  3. Step 3: Cross multiply
    280.66x = 420.84 × 104.89
  4. Step 4: Simplify right side
    280.66x = 44,141.91
  5. Step 5: Solve for x
    x = 44,141.91/280.66
  6. Step 6: Final answer
    x = 157.28

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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.