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Finding the Fourth Proportional to 28,392.88, 39,186.84 and 15,821.68

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Solution

The fourth proportional to 28,392.88, 39,186.84 and 15,821.68 is: 21,836.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,392.88 : 39,186.84 = 15,821.68 : x
  2. Step 2: Convert to fraction form
    28,392.88/39,186.84 = 15,821.68/x
  3. Step 3: Cross multiply
    28,392.88x = 39,186.84 × 15,821.68
  4. Step 4: Simplify right side
    28,392.88x = 620,001,642.69
  5. Step 5: Solve for x
    x = 620,001,642.69/28,392.88
  6. Step 6: Final answer
    x = 21,836.52

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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.