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Finding the Fourth Proportional to 420.68, 580.55 and 234.18

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Solution

The fourth proportional to 420.68, 580.55 and 234.18 is: 323.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.68 : 580.55 = 234.18 : x
  2. Step 2: Convert to fraction form
    420.68/580.55 = 234.18/x
  3. Step 3: Cross multiply
    420.68x = 580.55 × 234.18
  4. Step 4: Simplify right side
    420.68x = 135,953.78
  5. Step 5: Solve for x
    x = 135,953.78/420.68
  6. Step 6: Final answer
    x = 323.17

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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.