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Finding the Fourth Proportional to 978,311.20, 1,372,124 and 978,311.20

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Solution

The fourth proportional to 978,311.20, 1,372,124 and 978,311.20 is: 1,372,124

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,311.20 : 1,372,124 = 978,311.20 : x
  2. Step 2: Convert to fraction form
    978,311.20/1,372,124 = 978,311.20/x
  3. Step 3: Cross multiply
    978,311.20x = 1,372,124 × 978,311.20
  4. Step 4: Simplify right side
    978,311.20x = 1,342,364,276,988.80
  5. Step 5: Solve for x
    x = 1,342,364,276,988.80/978,311.20
  6. Step 6: Final answer
    x = 1,372,124

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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.