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Finding the Fourth Proportional to 1,001,868.12, 1,382,786.94 and 921,168.12

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Solution

The fourth proportional to 1,001,868.12, 1,382,786.94 and 921,168.12 is: 1,271,404.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001,868.12 : 1,382,786.94 = 921,168.12 : x
  2. Step 2: Convert to fraction form
    1,001,868.12/1,382,786.94 = 921,168.12/x
  3. Step 3: Cross multiply
    1,001,868.12x = 1,382,786.94 × 921,168.12
  4. Step 4: Simplify right side
    1,001,868.12x = 1,273,779,245,880.35
  5. Step 5: Solve for x
    x = 1,273,779,245,880.35/1,001,868.12
  6. Step 6: Final answer
    x = 1,271,404.11

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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.