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Finding the Fourth Proportional to 2,009.10, 3,012.30 and 912.90

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Solution

The fourth proportional to 2,009.10, 3,012.30 and 912.90 is: 1,368.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,009.10 : 3,012.30 = 912.90 : x
  2. Step 2: Convert to fraction form
    2,009.10/3,012.30 = 912.90/x
  3. Step 3: Cross multiply
    2,009.10x = 3,012.30 × 912.90
  4. Step 4: Simplify right side
    2,009.10x = 2,749,928.67
  5. Step 5: Solve for x
    x = 2,749,928.67/2,009.10
  6. Step 6: Final answer
    x = 1,368.74

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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.