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Finding the Fourth Proportional to 978,378.70, 1,372,218.50 and 978,378.70

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Solution

The fourth proportional to 978,378.70, 1,372,218.50 and 978,378.70 is: 1,372,218.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,378.70 : 1,372,218.50 = 978,378.70 : x
  2. Step 2: Convert to fraction form
    978,378.70/1,372,218.50 = 978,378.70/x
  3. Step 3: Cross multiply
    978,378.70x = 1,372,218.50 × 978,378.70
  4. Step 4: Simplify right side
    978,378.70x = 1,342,549,352,145.95
  5. Step 5: Solve for x
    x = 1,342,549,352,145.95/978,378.70
  6. Step 6: Final answer
    x = 1,372,218.50

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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.