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Finding the Fourth Proportional to 990,489.78, 1,486,324.89 and 359,452.80

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Solution

The fourth proportional to 990,489.78, 1,486,324.89 and 359,452.80 is: 539,393.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    990,489.78 : 1,486,324.89 = 359,452.80 : x
  2. Step 2: Convert to fraction form
    990,489.78/1,486,324.89 = 359,452.80/x
  3. Step 3: Cross multiply
    990,489.78x = 1,486,324.89 × 359,452.80
  4. Step 4: Simplify right side
    990,489.78x = 534,263,643,420.19
  5. Step 5: Solve for x
    x = 534,263,643,420.19/990,489.78
  6. Step 6: Final answer
    x = 539,393.39

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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.