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Finding the Fourth Proportional to 572.10, 857.55 and 415.55

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Solution

The fourth proportional to 572.10, 857.55 and 415.55 is: 622.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.10 : 857.55 = 415.55 : x
  2. Step 2: Convert to fraction form
    572.10/857.55 = 415.55/x
  3. Step 3: Cross multiply
    572.10x = 857.55 × 415.55
  4. Step 4: Simplify right side
    572.10x = 356,354.90
  5. Step 5: Solve for x
    x = 356,354.90/572.10
  6. Step 6: Final answer
    x = 622.89

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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.