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Finding the Fourth Proportional to 849.40, 1,274.10 and 784.60

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Solution

The fourth proportional to 849.40, 1,274.10 and 784.60 is: 1,176.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.40 : 1,274.10 = 784.60 : x
  2. Step 2: Convert to fraction form
    849.40/1,274.10 = 784.60/x
  3. Step 3: Cross multiply
    849.40x = 1,274.10 × 784.60
  4. Step 4: Simplify right side
    849.40x = 999,658.86
  5. Step 5: Solve for x
    x = 999,658.86/849.40
  6. Step 6: Final answer
    x = 1,176.90

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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.