Home / 13,931.68-21,021.76-13,391.68

Finding the Fourth Proportional to 13,931.68, 21,021.76 and 13,391.68

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Solution

The fourth proportional to 13,931.68, 21,021.76 and 13,391.68 is: 20,206.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,931.68 : 21,021.76 = 13,391.68 : x
  2. Step 2: Convert to fraction form
    13,931.68/21,021.76 = 13,391.68/x
  3. Step 3: Cross multiply
    13,931.68x = 21,021.76 × 13,391.68
  4. Step 4: Simplify right side
    13,931.68x = 281,516,682.96
  5. Step 5: Solve for x
    x = 281,516,682.96/13,931.68
  6. Step 6: Final answer
    x = 20,206.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.