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Finding the Fourth Proportional to 1,276.40, 1,911.40 and 1,020.40

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Solution

The fourth proportional to 1,276.40, 1,911.40 and 1,020.40 is: 1,528.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.40 : 1,911.40 = 1,020.40 : x
  2. Step 2: Convert to fraction form
    1,276.40/1,911.40 = 1,020.40/x
  3. Step 3: Cross multiply
    1,276.40x = 1,911.40 × 1,020.40
  4. Step 4: Simplify right side
    1,276.40x = 1,950,392.56
  5. Step 5: Solve for x
    x = 1,950,392.56/1,276.40
  6. Step 6: Final answer
    x = 1,528.04

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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.