Home / 28,386.90-39,173.22-15,811.38

Finding the Fourth Proportional to 28,386.90, 39,173.22 and 15,811.38

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Solution

The fourth proportional to 28,386.90, 39,173.22 and 15,811.38 is: 21,819.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,386.90 : 39,173.22 = 15,811.38 : x
  2. Step 2: Convert to fraction form
    28,386.90/39,173.22 = 15,811.38/x
  3. Step 3: Cross multiply
    28,386.90x = 39,173.22 × 15,811.38
  4. Step 4: Simplify right side
    28,386.90x = 619,382,667.24
  5. Step 5: Solve for x
    x = 619,382,667.24/28,386.90
  6. Step 6: Final answer
    x = 21,819.31

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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.