Home / 7,800.20-11,700.30-3,122.45

Finding the Fourth Proportional to 7,800.20, 11,700.30 and 3,122.45

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Solution

The fourth proportional to 7,800.20, 11,700.30 and 3,122.45 is: 4,683.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,800.20 : 11,700.30 = 3,122.45 : x
  2. Step 2: Convert to fraction form
    7,800.20/11,700.30 = 3,122.45/x
  3. Step 3: Cross multiply
    7,800.20x = 11,700.30 × 3,122.45
  4. Step 4: Simplify right side
    7,800.20x = 36,533,601.74
  5. Step 5: Solve for x
    x = 36,533,601.74/7,800.20
  6. Step 6: Final answer
    x = 4,683.68

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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.