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Finding the Fourth Proportional to 1,990,892.80, 2,986,723.20 and 853,638.40

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Solution

The fourth proportional to 1,990,892.80, 2,986,723.20 and 853,638.40 is: 1,280,622.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990,892.80 : 2,986,723.20 = 853,638.40 : x
  2. Step 2: Convert to fraction form
    1,990,892.80/2,986,723.20 = 853,638.40/x
  3. Step 3: Cross multiply
    1,990,892.80x = 2,986,723.20 × 853,638.40
  4. Step 4: Simplify right side
    1,990,892.80x = 2,549,581,613,690.88
  5. Step 5: Solve for x
    x = 2,549,581,613,690.88/1,990,892.80
  6. Step 6: Final answer
    x = 1,280,622.25

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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.