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Finding the Fourth Proportional to 15,886.47, 21,923.28 and 8,813.55

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Solution

The fourth proportional to 15,886.47, 21,923.28 and 8,813.55 is: 12,162.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,886.47 : 21,923.28 = 8,813.55 : x
  2. Step 2: Convert to fraction form
    15,886.47/21,923.28 = 8,813.55/x
  3. Step 3: Cross multiply
    15,886.47x = 21,923.28 × 8,813.55
  4. Step 4: Simplify right side
    15,886.47x = 193,221,924.44
  5. Step 5: Solve for x
    x = 193,221,924.44/15,886.47
  6. Step 6: Final answer
    x = 12,162.67

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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.