Home / 5,415.81-8,123.70-1,311.81

Finding the Fourth Proportional to 5,415.81, 8,123.70 and 1,311.81

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Solution

The fourth proportional to 5,415.81, 8,123.70 and 1,311.81 is: 1,967.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,415.81 : 8,123.70 = 1,311.81 : x
  2. Step 2: Convert to fraction form
    5,415.81/8,123.70 = 1,311.81/x
  3. Step 3: Cross multiply
    5,415.81x = 8,123.70 × 1,311.81
  4. Step 4: Simplify right side
    5,415.81x = 10,656,750.90
  5. Step 5: Solve for x
    x = 10,656,750.90/5,415.81
  6. Step 6: Final answer
    x = 1,967.71

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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.