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Finding the Fourth Proportional to 648.20, 893.90 and 555.26

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Solution

The fourth proportional to 648.20, 893.90 and 555.26 is: 765.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.20 : 893.90 = 555.26 : x
  2. Step 2: Convert to fraction form
    648.20/893.90 = 555.26/x
  3. Step 3: Cross multiply
    648.20x = 893.90 × 555.26
  4. Step 4: Simplify right side
    648.20x = 496,343.83
  5. Step 5: Solve for x
    x = 496,343.83/648.20
  6. Step 6: Final answer
    x = 765.72

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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.