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Finding the Fourth Proportional to 1,763,978.40, 2,638,969.20 and 1,529,920.80

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Solution

The fourth proportional to 1,763,978.40, 2,638,969.20 and 1,529,920.80 is: 2,288,811.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,763,978.40 : 2,638,969.20 = 1,529,920.80 : x
  2. Step 2: Convert to fraction form
    1,763,978.40/2,638,969.20 = 1,529,920.80/x
  3. Step 3: Cross multiply
    1,763,978.40x = 2,638,969.20 × 1,529,920.80
  4. Step 4: Simplify right side
    1,763,978.40x = 4,037,413,869,639.36
  5. Step 5: Solve for x
    x = 4,037,413,869,639.36/1,763,978.40
  6. Step 6: Final answer
    x = 2,288,811.40

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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.