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Finding the Fourth Proportional to 420.03, 579.50 and 253.95

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Solution

The fourth proportional to 420.03, 579.50 and 253.95 is: 350.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.03 : 579.50 = 253.95 : x
  2. Step 2: Convert to fraction form
    420.03/579.50 = 253.95/x
  3. Step 3: Cross multiply
    420.03x = 579.50 × 253.95
  4. Step 4: Simplify right side
    420.03x = 147,165.84
  5. Step 5: Solve for x
    x = 147,165.84/420.03
  6. Step 6: Final answer
    x = 350.37

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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.