Home / 3,123.45-4,687.20-1,807.20

Finding the Fourth Proportional to 3,123.45, 4,687.20 and 1,807.20

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Solution

The fourth proportional to 3,123.45, 4,687.20 and 1,807.20 is: 2,711.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,123.45 : 4,687.20 = 1,807.20 : x
  2. Step 2: Convert to fraction form
    3,123.45/4,687.20 = 1,807.20/x
  3. Step 3: Cross multiply
    3,123.45x = 4,687.20 × 1,807.20
  4. Step 4: Simplify right side
    3,123.45x = 8,470,707.84
  5. Step 5: Solve for x
    x = 8,470,707.84/3,123.45
  6. Step 6: Final answer
    x = 2,711.97

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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.