Home / 20,391.34-28,140.18-11,899.36

Finding the Fourth Proportional to 20,391.34, 28,140.18 and 11,899.36

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Solution

The fourth proportional to 20,391.34, 28,140.18 and 11,899.36 is: 16,421.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.34 : 28,140.18 = 11,899.36 : x
  2. Step 2: Convert to fraction form
    20,391.34/28,140.18 = 11,899.36/x
  3. Step 3: Cross multiply
    20,391.34x = 28,140.18 × 11,899.36
  4. Step 4: Simplify right side
    20,391.34x = 334,850,132.28
  5. Step 5: Solve for x
    x = 334,850,132.28/20,391.34
  6. Step 6: Final answer
    x = 16,421.19

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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.