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Finding the Fourth Proportional to 614.53, 921.77 and 428.90

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Solution

The fourth proportional to 614.53, 921.77 and 428.90 is: 643.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.53 : 921.77 = 428.90 : x
  2. Step 2: Convert to fraction form
    614.53/921.77 = 428.90/x
  3. Step 3: Cross multiply
    614.53x = 921.77 × 428.90
  4. Step 4: Simplify right side
    614.53x = 395,347.15
  5. Step 5: Solve for x
    x = 395,347.15/614.53
  6. Step 6: Final answer
    x = 643.33

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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.