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Finding the Fourth Proportional to 940.92, 1,408.08 and 648.72

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Solution

The fourth proportional to 940.92, 1,408.08 and 648.72 is: 970.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.92 : 1,408.08 = 648.72 : x
  2. Step 2: Convert to fraction form
    940.92/1,408.08 = 648.72/x
  3. Step 3: Cross multiply
    940.92x = 1,408.08 × 648.72
  4. Step 4: Simplify right side
    940.92x = 913,449.66
  5. Step 5: Solve for x
    x = 913,449.66/940.92
  6. Step 6: Final answer
    x = 970.80

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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.