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Finding the Fourth Proportional to 849.99, 1,274.64 and 439.12

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Solution

The fourth proportional to 849.99, 1,274.64 and 439.12 is: 658.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.99 : 1,274.64 = 439.12 : x
  2. Step 2: Convert to fraction form
    849.99/1,274.64 = 439.12/x
  3. Step 3: Cross multiply
    849.99x = 1,274.64 × 439.12
  4. Step 4: Simplify right side
    849.99x = 559,719.86
  5. Step 5: Solve for x
    x = 559,719.86/849.99
  6. Step 6: Final answer
    x = 658.50

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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.