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Finding the Fourth Proportional to 280.56, 420.70 and 178.05

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Solution

The fourth proportional to 280.56, 420.70 and 178.05 is: 266.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.56 : 420.70 = 178.05 : x
  2. Step 2: Convert to fraction form
    280.56/420.70 = 178.05/x
  3. Step 3: Cross multiply
    280.56x = 420.70 × 178.05
  4. Step 4: Simplify right side
    280.56x = 74,905.19
  5. Step 5: Solve for x
    x = 74,905.19/280.56
  6. Step 6: Final answer
    x = 266.98

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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.