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Finding the Fourth Proportional to 648.58, 890.69 and 555.33

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Solution

The fourth proportional to 648.58, 890.69 and 555.33 is: 762.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.58 : 890.69 = 555.33 : x
  2. Step 2: Convert to fraction form
    648.58/890.69 = 555.33/x
  3. Step 3: Cross multiply
    648.58x = 890.69 × 555.33
  4. Step 4: Simplify right side
    648.58x = 494,626.88
  5. Step 5: Solve for x
    x = 494,626.88/648.58
  6. Step 6: Final answer
    x = 762.63

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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.