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Finding the Fourth Proportional to 279,915.60, 420,310.80 and 161,817.60

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Solution

The fourth proportional to 279,915.60, 420,310.80 and 161,817.60 is: 242,979.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,915.60 : 420,310.80 = 161,817.60 : x
  2. Step 2: Convert to fraction form
    279,915.60/420,310.80 = 161,817.60/x
  3. Step 3: Cross multiply
    279,915.60x = 420,310.80 × 161,817.60
  4. Step 4: Simplify right side
    279,915.60x = 68,013,684,910.08
  5. Step 5: Solve for x
    x = 68,013,684,910.08/279,915.60
  6. Step 6: Final answer
    x = 242,979.26

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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.