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Finding the Fourth Proportional to 7,158,782, 9,879,120.78 and 3,939,518

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Solution

The fourth proportional to 7,158,782, 9,879,120.78 and 3,939,518 is: 5,436,535.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,158,782 : 9,879,120.78 = 3,939,518 : x
  2. Step 2: Convert to fraction form
    7,158,782/9,879,120.78 = 3,939,518/x
  3. Step 3: Cross multiply
    7,158,782x = 9,879,120.78 × 3,939,518
  4. Step 4: Simplify right side
    7,158,782x = 38,918,974,136,984.04
  5. Step 5: Solve for x
    x = 38,918,974,136,984.04/7,158,782
  6. Step 6: Final answer
    x = 5,436,535.73

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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.