Home / 20,390.01-28,139.01-11,315.31

Finding the Fourth Proportional to 20,390.01, 28,139.01 and 11,315.31

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Solution

The fourth proportional to 20,390.01, 28,139.01 and 11,315.31 is: 15,615.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.01 : 28,139.01 = 11,315.31 : x
  2. Step 2: Convert to fraction form
    20,390.01/28,139.01 = 11,315.31/x
  3. Step 3: Cross multiply
    20,390.01x = 28,139.01 × 11,315.31
  4. Step 4: Simplify right side
    20,390.01x = 318,401,621.24
  5. Step 5: Solve for x
    x = 318,401,621.24/20,390.01
  6. Step 6: Final answer
    x = 15,615.57

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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.