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Finding the Fourth Proportional to 911,715.21, 1,367,157.02 and 378,918.81

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Solution

The fourth proportional to 911,715.21, 1,367,157.02 and 378,918.81 is: 568,205.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    911,715.21 : 1,367,157.02 = 378,918.81 : x
  2. Step 2: Convert to fraction form
    911,715.21/1,367,157.02 = 378,918.81/x
  3. Step 3: Cross multiply
    911,715.21x = 1,367,157.02 × 378,918.81
  4. Step 4: Simplify right side
    911,715.21x = 518,041,509,206.95
  5. Step 5: Solve for x
    x = 518,041,509,206.95/911,715.21
  6. Step 6: Final answer
    x = 568,205.40

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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.