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Finding the Fourth Proportional to 940.39, 1,408.14 and 648.79

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Solution

The fourth proportional to 940.39, 1,408.14 and 648.79 is: 971.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.39 : 1,408.14 = 648.79 : x
  2. Step 2: Convert to fraction form
    940.39/1,408.14 = 648.79/x
  3. Step 3: Cross multiply
    940.39x = 1,408.14 × 648.79
  4. Step 4: Simplify right side
    940.39x = 913,587.15
  5. Step 5: Solve for x
    x = 913,587.15/940.39
  6. Step 6: Final answer
    x = 971.50

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1.5x scale

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.