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Finding the Fourth Proportional to 420.22, 579.90 and 233.67

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Solution

The fourth proportional to 420.22, 579.90 and 233.67 is: 322.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.22 : 579.90 = 233.67 : x
  2. Step 2: Convert to fraction form
    420.22/579.90 = 233.67/x
  3. Step 3: Cross multiply
    420.22x = 579.90 × 233.67
  4. Step 4: Simplify right side
    420.22x = 135,505.23
  5. Step 5: Solve for x
    x = 135,505.23/420.22
  6. Step 6: Final answer
    x = 322.46

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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.