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Finding the Fourth Proportional to 402.30, 551.54 and 389.34

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Solution

The fourth proportional to 402.30, 551.54 and 389.34 is: 533.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.30 : 551.54 = 389.34 : x
  2. Step 2: Convert to fraction form
    402.30/551.54 = 389.34/x
  3. Step 3: Cross multiply
    402.30x = 551.54 × 389.34
  4. Step 4: Simplify right side
    402.30x = 214,734.64
  5. Step 5: Solve for x
    x = 214,734.64/402.30
  6. Step 6: Final answer
    x = 533.77

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.