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Finding the Fourth Proportional to 386,450.40, 579,675.60 and 280,696.80

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Solution

The fourth proportional to 386,450.40, 579,675.60 and 280,696.80 is: 421,045.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,450.40 : 579,675.60 = 280,696.80 : x
  2. Step 2: Convert to fraction form
    386,450.40/579,675.60 = 280,696.80/x
  3. Step 3: Cross multiply
    386,450.40x = 579,675.60 × 280,696.80
  4. Step 4: Simplify right side
    386,450.40x = 162,713,085,958.08
  5. Step 5: Solve for x
    x = 162,713,085,958.08/386,450.40
  6. Step 6: Final answer
    x = 421,045.20

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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.