Home / 20,861.81-31,292.71-13,855.50

Finding the Fourth Proportional to 20,861.81, 31,292.71 and 13,855.50

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Solution

The fourth proportional to 20,861.81, 31,292.71 and 13,855.50 is: 20,783.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.81 : 31,292.71 = 13,855.50 : x
  2. Step 2: Convert to fraction form
    20,861.81/31,292.71 = 13,855.50/x
  3. Step 3: Cross multiply
    20,861.81x = 31,292.71 × 13,855.50
  4. Step 4: Simplify right side
    20,861.81x = 433,576,074.13
  5. Step 5: Solve for x
    x = 433,576,074.13/20,861.81
  6. Step 6: Final answer
    x = 20,783.24

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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.