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Finding the Fourth Proportional to 420.39, 580.18 and 296.35

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Solution

The fourth proportional to 420.39, 580.18 and 296.35 is: 408.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.39 : 580.18 = 296.35 : x
  2. Step 2: Convert to fraction form
    420.39/580.18 = 296.35/x
  3. Step 3: Cross multiply
    420.39x = 580.18 × 296.35
  4. Step 4: Simplify right side
    420.39x = 171,936.34
  5. Step 5: Solve for x
    x = 171,936.34/420.39
  6. Step 6: Final answer
    x = 408.99

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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.