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Finding the Fourth Proportional to 420.84, 580.54 and 371.84

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Solution

The fourth proportional to 420.84, 580.54 and 371.84 is: 512.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.84 : 580.54 = 371.84 : x
  2. Step 2: Convert to fraction form
    420.84/580.54 = 371.84/x
  3. Step 3: Cross multiply
    420.84x = 580.54 × 371.84
  4. Step 4: Simplify right side
    420.84x = 215,867.99
  5. Step 5: Solve for x
    x = 215,867.99/420.84
  6. Step 6: Final answer
    x = 512.95

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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.