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Finding the Fourth Proportional to 942.69, 1,300.97 and 648.09

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Solution

The fourth proportional to 942.69, 1,300.97 and 648.09 is: 894.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.69 : 1,300.97 = 648.09 : x
  2. Step 2: Convert to fraction form
    942.69/1,300.97 = 648.09/x
  3. Step 3: Cross multiply
    942.69x = 1,300.97 × 648.09
  4. Step 4: Simplify right side
    942.69x = 843,142.41
  5. Step 5: Solve for x
    x = 843,142.41/942.69
  6. Step 6: Final answer
    x = 894.40

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.