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Finding the Fourth Proportional to 450.21, 619.85 and 384.45

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Solution

The fourth proportional to 450.21, 619.85 and 384.45 is: 529.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.21 : 619.85 = 384.45 : x
  2. Step 2: Convert to fraction form
    450.21/619.85 = 384.45/x
  3. Step 3: Cross multiply
    450.21x = 619.85 × 384.45
  4. Step 4: Simplify right side
    450.21x = 238,301.33
  5. Step 5: Solve for x
    x = 238,301.33/450.21
  6. Step 6: Final answer
    x = 529.31

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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.