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Finding the Fourth Proportional to 420.12, 579.87 and 262.89

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Solution

The fourth proportional to 420.12, 579.87 and 262.89 is: 362.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.12 : 579.87 = 262.89 : x
  2. Step 2: Convert to fraction form
    420.12/579.87 = 262.89/x
  3. Step 3: Cross multiply
    420.12x = 579.87 × 262.89
  4. Step 4: Simplify right side
    420.12x = 152,442.02
  5. Step 5: Solve for x
    x = 152,442.02/420.12
  6. Step 6: Final answer
    x = 362.85

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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.