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Finding the Fourth Proportional to 648.78, 894.96 and 415.50

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Solution

The fourth proportional to 648.78, 894.96 and 415.50 is: 573.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.78 : 894.96 = 415.50 : x
  2. Step 2: Convert to fraction form
    648.78/894.96 = 415.50/x
  3. Step 3: Cross multiply
    648.78x = 894.96 × 415.50
  4. Step 4: Simplify right side
    648.78x = 371,855.88
  5. Step 5: Solve for x
    x = 371,855.88/648.78
  6. Step 6: Final answer
    x = 573.16

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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.