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Finding the Fourth Proportional to 984,389.20, 1,379,078 and 984,389.20

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Solution

The fourth proportional to 984,389.20, 1,379,078 and 984,389.20 is: 1,379,078

Step by Step Solution

  1. Step 1: Write the proportion equation
    984,389.20 : 1,379,078 = 984,389.20 : x
  2. Step 2: Convert to fraction form
    984,389.20/1,379,078 = 984,389.20/x
  3. Step 3: Cross multiply
    984,389.20x = 1,379,078 × 984,389.20
  4. Step 4: Simplify right side
    984,389.20x = 1,357,549,489,157.60
  5. Step 5: Solve for x
    x = 1,357,549,489,157.60/984,389.20
  6. Step 6: Final answer
    x = 1,379,078

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.