Home / 420,190.50-630,291.21-139,707.75

Finding the Fourth Proportional to 420,190.50, 630,291.21 and 139,707.75

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Solution

The fourth proportional to 420,190.50, 630,291.21 and 139,707.75 is: 209,563.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,190.50 : 630,291.21 = 139,707.75 : x
  2. Step 2: Convert to fraction form
    420,190.50/630,291.21 = 139,707.75/x
  3. Step 3: Cross multiply
    420,190.50x = 630,291.21 × 139,707.75
  4. Step 4: Simplify right side
    420,190.50x = 88,056,566,793.88
  5. Step 5: Solve for x
    x = 88,056,566,793.88/420,190.50
  6. Step 6: Final answer
    x = 209,563.44

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1.5x scale

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.