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Finding the Fourth Proportional to 980,930.60, 1,471,395.90 and 420,021.80

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Solution

The fourth proportional to 980,930.60, 1,471,395.90 and 420,021.80 is: 630,032.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    980,930.60 : 1,471,395.90 = 420,021.80 : x
  2. Step 2: Convert to fraction form
    980,930.60/1,471,395.90 = 420,021.80/x
  3. Step 3: Cross multiply
    980,930.60x = 1,471,395.90 × 420,021.80
  4. Step 4: Simplify right side
    980,930.60x = 618,018,354,430.62
  5. Step 5: Solve for x
    x = 618,018,354,430.62/980,930.60
  6. Step 6: Final answer
    x = 630,032.70

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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.