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Finding the Fourth Proportional to 451.01, 621.80 and 310.87

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Solution

The fourth proportional to 451.01, 621.80 and 310.87 is: 428.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.01 : 621.80 = 310.87 : x
  2. Step 2: Convert to fraction form
    451.01/621.80 = 310.87/x
  3. Step 3: Cross multiply
    451.01x = 621.80 × 310.87
  4. Step 4: Simplify right side
    451.01x = 193,298.97
  5. Step 5: Solve for x
    x = 193,298.97/451.01
  6. Step 6: Final answer
    x = 428.59

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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.