Home / 20,805.47-28,711.64-11,853.35

Finding the Fourth Proportional to 20,805.47, 28,711.64 and 11,853.35

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Solution

The fourth proportional to 20,805.47, 28,711.64 and 11,853.35 is: 16,357.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.47 : 28,711.64 = 11,853.35 : x
  2. Step 2: Convert to fraction form
    20,805.47/28,711.64 = 11,853.35/x
  3. Step 3: Cross multiply
    20,805.47x = 28,711.64 × 11,853.35
  4. Step 4: Simplify right side
    20,805.47x = 340,329,058.73
  5. Step 5: Solve for x
    x = 340,329,058.73/20,805.47
  6. Step 6: Final answer
    x = 16,357.67

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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.