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Finding the Fourth Proportional to 978,412.40, 1,366,978 and 978,412.40

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Solution

The fourth proportional to 978,412.40, 1,366,978 and 978,412.40 is: 1,366,978

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,412.40 : 1,366,978 = 978,412.40 : x
  2. Step 2: Convert to fraction form
    978,412.40/1,366,978 = 978,412.40/x
  3. Step 3: Cross multiply
    978,412.40x = 1,366,978 × 978,412.40
  4. Step 4: Simplify right side
    978,412.40x = 1,337,468,225,727.20
  5. Step 5: Solve for x
    x = 1,337,468,225,727.20/978,412.40
  6. Step 6: Final answer
    x = 1,366,978

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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.