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Finding the Fourth Proportional to 408,085.80, 612,128.70 and 282,114.60

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Solution

The fourth proportional to 408,085.80, 612,128.70 and 282,114.60 is: 423,171.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,085.80 : 612,128.70 = 282,114.60 : x
  2. Step 2: Convert to fraction form
    408,085.80/612,128.70 = 282,114.60/x
  3. Step 3: Cross multiply
    408,085.80x = 612,128.70 × 282,114.60
  4. Step 4: Simplify right side
    408,085.80x = 172,690,443,349.02
  5. Step 5: Solve for x
    x = 172,690,443,349.02/408,085.80
  6. Step 6: Final answer
    x = 423,171.90

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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.