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Finding the Fourth Proportional to 648.63, 972.91 and 186.40

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Solution

The fourth proportional to 648.63, 972.91 and 186.40 is: 279.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.63 : 972.91 = 186.40 : x
  2. Step 2: Convert to fraction form
    648.63/972.91 = 186.40/x
  3. Step 3: Cross multiply
    648.63x = 972.91 × 186.40
  4. Step 4: Simplify right side
    648.63x = 181,354.05
  5. Step 5: Solve for x
    x = 181,354.05/648.63
  6. Step 6: Final answer
    x = 279.60

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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.