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Finding the Fourth Proportional to 1,310,672.70, 1,966,009.05 and 1,121,715.90

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Solution

The fourth proportional to 1,310,672.70, 1,966,009.05 and 1,121,715.90 is: 1,682,573.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310,672.70 : 1,966,009.05 = 1,121,715.90 : x
  2. Step 2: Convert to fraction form
    1,310,672.70/1,966,009.05 = 1,121,715.90/x
  3. Step 3: Cross multiply
    1,310,672.70x = 1,966,009.05 × 1,121,715.90
  4. Step 4: Simplify right side
    1,310,672.70x = 2,205,303,610,928.90
  5. Step 5: Solve for x
    x = 2,205,303,610,928.90/1,310,672.70
  6. Step 6: Final answer
    x = 1,682,573.85

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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.