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Finding the Fourth Proportional to 280.05, 419.79 and 97.40

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Solution

The fourth proportional to 280.05, 419.79 and 97.40 is: 145.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.05 : 419.79 = 97.40 : x
  2. Step 2: Convert to fraction form
    280.05/419.79 = 97.40/x
  3. Step 3: Cross multiply
    280.05x = 419.79 × 97.40
  4. Step 4: Simplify right side
    280.05x = 40,885.45
  5. Step 5: Solve for x
    x = 40,885.45/280.05
  6. Step 6: Final answer
    x = 145.99

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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.