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Finding the Fourth Proportional to 280,639.60, 420,959.40 and 168,665.20

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Solution

The fourth proportional to 280,639.60, 420,959.40 and 168,665.20 is: 252,997.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,639.60 : 420,959.40 = 168,665.20 : x
  2. Step 2: Convert to fraction form
    280,639.60/420,959.40 = 168,665.20/x
  3. Step 3: Cross multiply
    280,639.60x = 420,959.40 × 168,665.20
  4. Step 4: Simplify right side
    280,639.60x = 71,001,201,392.88
  5. Step 5: Solve for x
    x = 71,001,201,392.88/280,639.60
  6. Step 6: Final answer
    x = 252,997.80

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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.