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Finding the Fourth Proportional to 1,821,155.80, 2,732,499.15 and 978,723.40

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Solution

The fourth proportional to 1,821,155.80, 2,732,499.15 and 978,723.40 is: 1,468,496.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821,155.80 : 2,732,499.15 = 978,723.40 : x
  2. Step 2: Convert to fraction form
    1,821,155.80/2,732,499.15 = 978,723.40/x
  3. Step 3: Cross multiply
    1,821,155.80x = 2,732,499.15 × 978,723.40
  4. Step 4: Simplify right side
    1,821,155.80x = 2,674,360,858,585.11
  5. Step 5: Solve for x
    x = 2,674,360,858,585.11/1,821,155.80
  6. Step 6: Final answer
    x = 1,468,496.47

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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.