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Finding the Fourth Proportional to 420.76, 580.65 and 246.20

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Solution

The fourth proportional to 420.76, 580.65 and 246.20 is: 339.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.76 : 580.65 = 246.20 : x
  2. Step 2: Convert to fraction form
    420.76/580.65 = 246.20/x
  3. Step 3: Cross multiply
    420.76x = 580.65 × 246.20
  4. Step 4: Simplify right side
    420.76x = 142,956.03
  5. Step 5: Solve for x
    x = 142,956.03/420.76
  6. Step 6: Final answer
    x = 339.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.