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Finding the Fourth Proportional to 2,011.20, 3,016.65 and 840.90

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Solution

The fourth proportional to 2,011.20, 3,016.65 and 840.90 is: 1,261.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,011.20 : 3,016.65 = 840.90 : x
  2. Step 2: Convert to fraction form
    2,011.20/3,016.65 = 840.90/x
  3. Step 3: Cross multiply
    2,011.20x = 3,016.65 × 840.90
  4. Step 4: Simplify right side
    2,011.20x = 2,536,700.99
  5. Step 5: Solve for x
    x = 2,536,700.99/2,011.20
  6. Step 6: Final answer
    x = 1,261.29

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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.