Home / 28,381.88-39,168.21-15,806.63

Finding the Fourth Proportional to 28,381.88, 39,168.21 and 15,806.63

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Solution

The fourth proportional to 28,381.88, 39,168.21 and 15,806.63 is: 21,813.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,381.88 : 39,168.21 = 15,806.63 : x
  2. Step 2: Convert to fraction form
    28,381.88/39,168.21 = 15,806.63/x
  3. Step 3: Cross multiply
    28,381.88x = 39,168.21 × 15,806.63
  4. Step 4: Simplify right side
    28,381.88x = 619,117,128.36
  5. Step 5: Solve for x
    x = 619,117,128.36/28,381.88
  6. Step 6: Final answer
    x = 21,813.82

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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.