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Finding the Fourth Proportional to 451.34, 621.45 and 384.80

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Solution

The fourth proportional to 451.34, 621.45 and 384.80 is: 529.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.34 : 621.45 = 384.80 : x
  2. Step 2: Convert to fraction form
    451.34/621.45 = 384.80/x
  3. Step 3: Cross multiply
    451.34x = 621.45 × 384.80
  4. Step 4: Simplify right side
    451.34x = 239,131.81
  5. Step 5: Solve for x
    x = 239,131.81/451.34
  6. Step 6: Final answer
    x = 529.83

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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.