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Finding the Fourth Proportional to 280,659.60, 420,989.40 and 168,685.20

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Solution

The fourth proportional to 280,659.60, 420,989.40 and 168,685.20 is: 253,027.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,659.60 : 420,989.40 = 168,685.20 : x
  2. Step 2: Convert to fraction form
    280,659.60/420,989.40 = 168,685.20/x
  3. Step 3: Cross multiply
    280,659.60x = 420,989.40 × 168,685.20
  4. Step 4: Simplify right side
    280,659.60x = 71,014,681,136.88
  5. Step 5: Solve for x
    x = 71,014,681,136.88/280,659.60
  6. Step 6: Final answer
    x = 253,027.80

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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.