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Finding the Fourth Proportional to 420.24, 580.72 and 346.56

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Solution

The fourth proportional to 420.24, 580.72 and 346.56 is: 478.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.24 : 580.72 = 346.56 : x
  2. Step 2: Convert to fraction form
    420.24/580.72 = 346.56/x
  3. Step 3: Cross multiply
    420.24x = 580.72 × 346.56
  4. Step 4: Simplify right side
    420.24x = 201,254.32
  5. Step 5: Solve for x
    x = 201,254.32/420.24
  6. Step 6: Final answer
    x = 478.90

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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.