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Finding the Fourth Proportional to 648.78, 973.14 and 186.56

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Solution

The fourth proportional to 648.78, 973.14 and 186.56 is: 279.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.78 : 973.14 = 186.56 : x
  2. Step 2: Convert to fraction form
    648.78/973.14 = 186.56/x
  3. Step 3: Cross multiply
    648.78x = 973.14 × 186.56
  4. Step 4: Simplify right side
    648.78x = 181,549.00
  5. Step 5: Solve for x
    x = 181,549.00/648.78
  6. Step 6: Final answer
    x = 279.83

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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.