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Finding the Fourth Proportional to 648.78, 973.34 and 186.59

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Solution

The fourth proportional to 648.78, 973.34 and 186.59 is: 279.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.78 : 973.34 = 186.59 : x
  2. Step 2: Convert to fraction form
    648.78/973.34 = 186.59/x
  3. Step 3: Cross multiply
    648.78x = 973.34 × 186.59
  4. Step 4: Simplify right side
    648.78x = 181,617.71
  5. Step 5: Solve for x
    x = 181,617.71/648.78
  6. Step 6: Final answer
    x = 279.94

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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.