Home / 20,856.07-31,311.51-12,438.01

Finding the Fourth Proportional to 20,856.07, 31,311.51 and 12,438.01

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Solution

The fourth proportional to 20,856.07, 31,311.51 and 12,438.01 is: 18,673.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.07 : 31,311.51 = 12,438.01 : x
  2. Step 2: Convert to fraction form
    20,856.07/31,311.51 = 12,438.01/x
  3. Step 3: Cross multiply
    20,856.07x = 31,311.51 × 12,438.01
  4. Step 4: Simplify right side
    20,856.07x = 389,452,874.50
  5. Step 5: Solve for x
    x = 389,452,874.50/20,856.07
  6. Step 6: Final answer
    x = 18,673.36

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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.