Home / 20,389.19-28,138.50-11,315.01

Finding the Fourth Proportional to 20,389.19, 28,138.50 and 11,315.01

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Solution

The fourth proportional to 20,389.19, 28,138.50 and 11,315.01 is: 15,615.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.19 : 28,138.50 = 11,315.01 : x
  2. Step 2: Convert to fraction form
    20,389.19/28,138.50 = 11,315.01/x
  3. Step 3: Cross multiply
    20,389.19x = 28,138.50 × 11,315.01
  4. Step 4: Simplify right side
    20,389.19x = 318,387,514.40
  5. Step 5: Solve for x
    x = 318,387,514.40/20,389.19
  6. Step 6: Final answer
    x = 15,615.51

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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.