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Finding the Fourth Proportional to 420.87, 580.77 and 243.77

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Solution

The fourth proportional to 420.87, 580.77 and 243.77 is: 336.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.87 : 580.77 = 243.77 : x
  2. Step 2: Convert to fraction form
    420.87/580.77 = 243.77/x
  3. Step 3: Cross multiply
    420.87x = 580.77 × 243.77
  4. Step 4: Simplify right side
    420.87x = 141,574.30
  5. Step 5: Solve for x
    x = 141,574.30/420.87
  6. Step 6: Final answer
    x = 336.38

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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.