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Finding the Fourth Proportional to 833.20, 1,247.10 and 768.40

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Solution

The fourth proportional to 833.20, 1,247.10 and 768.40 is: 1,150.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.20 : 1,247.10 = 768.40 : x
  2. Step 2: Convert to fraction form
    833.20/1,247.10 = 768.40/x
  3. Step 3: Cross multiply
    833.20x = 1,247.10 × 768.40
  4. Step 4: Simplify right side
    833.20x = 958,271.64
  5. Step 5: Solve for x
    x = 958,271.64/833.20
  6. Step 6: Final answer
    x = 1,150.11

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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.