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Finding the Fourth Proportional to 1,742,892.21, 2,405,416.37 and 978,945.75

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Solution

The fourth proportional to 1,742,892.21, 2,405,416.37 and 978,945.75 is: 1,351,071.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,742,892.21 : 2,405,416.37 = 978,945.75 : x
  2. Step 2: Convert to fraction form
    1,742,892.21/2,405,416.37 = 978,945.75/x
  3. Step 3: Cross multiply
    1,742,892.21x = 2,405,416.37 × 978,945.75
  4. Step 4: Simplify right side
    1,742,892.21x = 2,354,772,127,497.20
  5. Step 5: Solve for x
    x = 2,354,772,127,497.20/1,742,892.21
  6. Step 6: Final answer
    x = 1,351,071.58

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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.