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Finding the Fourth Proportional to 420.30, 579.89 and 263.05

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Solution

The fourth proportional to 420.30, 579.89 and 263.05 is: 362.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.30 : 579.89 = 263.05 : x
  2. Step 2: Convert to fraction form
    420.30/579.89 = 263.05/x
  3. Step 3: Cross multiply
    420.30x = 579.89 × 263.05
  4. Step 4: Simplify right side
    420.30x = 152,539.27
  5. Step 5: Solve for x
    x = 152,539.27/420.30
  6. Step 6: Final answer
    x = 362.93

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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.