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Finding the Fourth Proportional to 849.36, 1,271.85 and 667.68

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Solution

The fourth proportional to 849.36, 1,271.85 and 667.68 is: 999.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.36 : 1,271.85 = 667.68 : x
  2. Step 2: Convert to fraction form
    849.36/1,271.85 = 667.68/x
  3. Step 3: Cross multiply
    849.36x = 1,271.85 × 667.68
  4. Step 4: Simplify right side
    849.36x = 849,188.81
  5. Step 5: Solve for x
    x = 849,188.81/849.36
  6. Step 6: Final answer
    x = 999.80

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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.