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Finding the Fourth Proportional to 978,427.20, 1,465,891.20 and 838,459.20

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Solution

The fourth proportional to 978,427.20, 1,465,891.20 and 838,459.20 is: 1,256,189.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,427.20 : 1,465,891.20 = 838,459.20 : x
  2. Step 2: Convert to fraction form
    978,427.20/1,465,891.20 = 838,459.20/x
  3. Step 3: Cross multiply
    978,427.20x = 1,465,891.20 × 838,459.20
  4. Step 4: Simplify right side
    978,427.20x = 1,229,089,962,839.04
  5. Step 5: Solve for x
    x = 1,229,089,962,839.04/978,427.20
  6. Step 6: Final answer
    x = 1,256,189.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.