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Finding the Fourth Proportional to 648.78, 973.22 and 186.55

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Solution

The fourth proportional to 648.78, 973.22 and 186.55 is: 279.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.78 : 973.22 = 186.55 : x
  2. Step 2: Convert to fraction form
    648.78/973.22 = 186.55/x
  3. Step 3: Cross multiply
    648.78x = 973.22 × 186.55
  4. Step 4: Simplify right side
    648.78x = 181,554.19
  5. Step 5: Solve for x
    x = 181,554.19/648.78
  6. Step 6: Final answer
    x = 279.84

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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.