Home / 28,091.60-38,765.64-15,515.60

Finding the Fourth Proportional to 28,091.60, 38,765.64 and 15,515.60

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Solution

The fourth proportional to 28,091.60, 38,765.64 and 15,515.60 is: 21,411.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,091.60 : 38,765.64 = 15,515.60 : x
  2. Step 2: Convert to fraction form
    28,091.60/38,765.64 = 15,515.60/x
  3. Step 3: Cross multiply
    28,091.60x = 38,765.64 × 15,515.60
  4. Step 4: Simplify right side
    28,091.60x = 601,472,163.98
  5. Step 5: Solve for x
    x = 601,472,163.98/28,091.60
  6. Step 6: Final answer
    x = 21,411.10

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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.