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Finding the Fourth Proportional to 514.89, 771.27 and 428.01

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Solution

The fourth proportional to 514.89, 771.27 and 428.01 is: 641.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.89 : 771.27 = 428.01 : x
  2. Step 2: Convert to fraction form
    514.89/771.27 = 428.01/x
  3. Step 3: Cross multiply
    514.89x = 771.27 × 428.01
  4. Step 4: Simplify right side
    514.89x = 330,111.27
  5. Step 5: Solve for x
    x = 330,111.27/514.89
  6. Step 6: Final answer
    x = 641.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.