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Finding the Fourth Proportional to 386,323.80, 579,485.70 and 120,082.20

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Solution

The fourth proportional to 386,323.80, 579,485.70 and 120,082.20 is: 180,123.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,323.80 : 579,485.70 = 120,082.20 : x
  2. Step 2: Convert to fraction form
    386,323.80/579,485.70 = 120,082.20/x
  3. Step 3: Cross multiply
    386,323.80x = 579,485.70 × 120,082.20
  4. Step 4: Simplify right side
    386,323.80x = 69,585,917,724.54
  5. Step 5: Solve for x
    x = 69,585,917,724.54/386,323.80
  6. Step 6: Final answer
    x = 180,123.30

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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.