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Finding the Fourth Proportional to 280,139.60, 420,209.40 and 139,847.60

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Solution

The fourth proportional to 280,139.60, 420,209.40 and 139,847.60 is: 209,771.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,139.60 : 420,209.40 = 139,847.60 : x
  2. Step 2: Convert to fraction form
    280,139.60/420,209.40 = 139,847.60/x
  3. Step 3: Cross multiply
    280,139.60x = 420,209.40 × 139,847.60
  4. Step 4: Simplify right side
    280,139.60x = 58,765,276,087.44
  5. Step 5: Solve for x
    x = 58,765,276,087.44/280,139.60
  6. Step 6: Final answer
    x = 209,771.40

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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.