Home / 28,456.12-39,269.48-15,880.88

Finding the Fourth Proportional to 28,456.12, 39,269.48 and 15,880.88

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Solution

The fourth proportional to 28,456.12, 39,269.48 and 15,880.88 is: 21,915.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,456.12 : 39,269.48 = 15,880.88 : x
  2. Step 2: Convert to fraction form
    28,456.12/39,269.48 = 15,880.88/x
  3. Step 3: Cross multiply
    28,456.12x = 39,269.48 × 15,880.88
  4. Step 4: Simplify right side
    28,456.12x = 623,633,899.54
  5. Step 5: Solve for x
    x = 623,633,899.54/28,456.12
  6. Step 6: Final answer
    x = 21,915.63

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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.