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Finding the Fourth Proportional to 1,388,435.15, 1,916,015.14 and 784,823.15

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Solution

The fourth proportional to 1,388,435.15, 1,916,015.14 and 784,823.15 is: 1,083,041.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,435.15 : 1,916,015.14 = 784,823.15 : x
  2. Step 2: Convert to fraction form
    1,388,435.15/1,916,015.14 = 784,823.15/x
  3. Step 3: Cross multiply
    1,388,435.15x = 1,916,015.14 × 784,823.15
  4. Step 4: Simplify right side
    1,388,435.15x = 1,503,733,043,393.56
  5. Step 5: Solve for x
    x = 1,503,733,043,393.56/1,388,435.15
  6. Step 6: Final answer
    x = 1,083,041.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.