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Finding the Fourth Proportional to 280,660.60, 420,990.90 and 168,686.20

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Solution

The fourth proportional to 280,660.60, 420,990.90 and 168,686.20 is: 253,029.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,660.60 : 420,990.90 = 168,686.20 : x
  2. Step 2: Convert to fraction form
    280,660.60/420,990.90 = 168,686.20/x
  3. Step 3: Cross multiply
    280,660.60x = 420,990.90 × 168,686.20
  4. Step 4: Simplify right side
    280,660.60x = 71,015,355,155.58
  5. Step 5: Solve for x
    x = 71,015,355,155.58/280,660.60
  6. Step 6: Final answer
    x = 253,029.30

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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.