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Finding the Fourth Proportional to 2,073.40, 3,109.20 and 840.40

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Solution

The fourth proportional to 2,073.40, 3,109.20 and 840.40 is: 1,260.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,073.40 : 3,109.20 = 840.40 : x
  2. Step 2: Convert to fraction form
    2,073.40/3,109.20 = 840.40/x
  3. Step 3: Cross multiply
    2,073.40x = 3,109.20 × 840.40
  4. Step 4: Simplify right side
    2,073.40x = 2,612,971.68
  5. Step 5: Solve for x
    x = 2,612,971.68/2,073.40
  6. Step 6: Final answer
    x = 1,260.24

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1.5x scale

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.