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Finding the Fourth Proportional to 420.84, 580.01 and 354.33

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Solution

The fourth proportional to 420.84, 580.01 and 354.33 is: 488.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.84 : 580.01 = 354.33 : x
  2. Step 2: Convert to fraction form
    420.84/580.01 = 354.33/x
  3. Step 3: Cross multiply
    420.84x = 580.01 × 354.33
  4. Step 4: Simplify right side
    420.84x = 205,513.17
  5. Step 5: Solve for x
    x = 205,513.17/420.84
  6. Step 6: Final answer
    x = 488.34

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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.