Home / 28,115.16-38,780.13-20,445.54

Finding the Fourth Proportional to 28,115.16, 38,780.13 and 20,445.54

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Solution

The fourth proportional to 28,115.16, 38,780.13 and 20,445.54 is: 28,201.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,115.16 : 38,780.13 = 20,445.54 : x
  2. Step 2: Convert to fraction form
    28,115.16/38,780.13 = 20,445.54/x
  3. Step 3: Cross multiply
    28,115.16x = 38,780.13 × 20,445.54
  4. Step 4: Simplify right side
    28,115.16x = 792,880,699.12
  5. Step 5: Solve for x
    x = 792,880,699.12/28,115.16
  6. Step 6: Final answer
    x = 28,201.18

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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.