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Finding the Fourth Proportional to 28,391.92, 39,180.06 and 15,645.16

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Solution

The fourth proportional to 28,391.92, 39,180.06 and 15,645.16 is: 21,589.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,391.92 : 39,180.06 = 15,645.16 : x
  2. Step 2: Convert to fraction form
    28,391.92/39,180.06 = 15,645.16/x
  3. Step 3: Cross multiply
    28,391.92x = 39,180.06 × 15,645.16
  4. Step 4: Simplify right side
    28,391.92x = 612,978,307.51
  5. Step 5: Solve for x
    x = 612,978,307.51/28,391.92
  6. Step 6: Final answer
    x = 21,589.89

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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.