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Finding the Fourth Proportional to 1,133.20, 1,698.20 and 838.40

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Solution

The fourth proportional to 1,133.20, 1,698.20 and 838.40 is: 1,256.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,133.20 : 1,698.20 = 838.40 : x
  2. Step 2: Convert to fraction form
    1,133.20/1,698.20 = 838.40/x
  3. Step 3: Cross multiply
    1,133.20x = 1,698.20 × 838.40
  4. Step 4: Simplify right side
    1,133.20x = 1,423,770.88
  5. Step 5: Solve for x
    x = 1,423,770.88/1,133.20
  6. Step 6: Final answer
    x = 1,256.42

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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.