Home / 28,376.16-39,141.36-20,405.76

Finding the Fourth Proportional to 28,376.16, 39,141.36 and 20,405.76

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Solution

The fourth proportional to 28,376.16, 39,141.36 and 20,405.76 is: 28,147.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,376.16 : 39,141.36 = 20,405.76 : x
  2. Step 2: Convert to fraction form
    28,376.16/39,141.36 = 20,405.76/x
  3. Step 3: Cross multiply
    28,376.16x = 39,141.36 × 20,405.76
  4. Step 4: Simplify right side
    28,376.16x = 798,709,198.23
  5. Step 5: Solve for x
    x = 798,709,198.23/28,376.16
  6. Step 6: Final answer
    x = 28,147.19

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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.