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Finding the Fourth Proportional to 614.74, 921.21 and 485.05

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Solution

The fourth proportional to 614.74, 921.21 and 485.05 is: 726.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.74 : 921.21 = 485.05 : x
  2. Step 2: Convert to fraction form
    614.74/921.21 = 485.05/x
  3. Step 3: Cross multiply
    614.74x = 921.21 × 485.05
  4. Step 4: Simplify right side
    614.74x = 446,832.91
  5. Step 5: Solve for x
    x = 446,832.91/614.74
  6. Step 6: Final answer
    x = 726.86

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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.