Home / 20,438.08-28,205.11-11,486.40

Finding the Fourth Proportional to 20,438.08, 28,205.11 and 11,486.40

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Solution

The fourth proportional to 20,438.08, 28,205.11 and 11,486.40 is: 15,851.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,438.08 : 28,205.11 = 11,486.40 : x
  2. Step 2: Convert to fraction form
    20,438.08/28,205.11 = 11,486.40/x
  3. Step 3: Cross multiply
    20,438.08x = 28,205.11 × 11,486.40
  4. Step 4: Simplify right side
    20,438.08x = 323,975,034.48
  5. Step 5: Solve for x
    x = 323,975,034.48/20,438.08
  6. Step 6: Final answer
    x = 15,851.54

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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.