Home / 20,981.08-28,953.89-11,421.01

Finding the Fourth Proportional to 20,981.08, 28,953.89 and 11,421.01

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Solution

The fourth proportional to 20,981.08, 28,953.89 and 11,421.01 is: 15,760.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.08 : 28,953.89 = 11,421.01 : x
  2. Step 2: Convert to fraction form
    20,981.08/28,953.89 = 11,421.01/x
  3. Step 3: Cross multiply
    20,981.08x = 28,953.89 × 11,421.01
  4. Step 4: Simplify right side
    20,981.08x = 330,682,522.46
  5. Step 5: Solve for x
    x = 330,682,522.46/20,981.08
  6. Step 6: Final answer
    x = 15,760.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.