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Finding the Fourth Proportional to 697.16, 1,040.74 and 648.56

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Solution

The fourth proportional to 697.16, 1,040.74 and 648.56 is: 968.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.16 : 1,040.74 = 648.56 : x
  2. Step 2: Convert to fraction form
    697.16/1,040.74 = 648.56/x
  3. Step 3: Cross multiply
    697.16x = 1,040.74 × 648.56
  4. Step 4: Simplify right side
    697.16x = 674,982.33
  5. Step 5: Solve for x
    x = 674,982.33/697.16
  6. Step 6: Final answer
    x = 968.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.