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Finding the Fourth Proportional to 15,886.55, 21,921.10 and 8,813.03

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Solution

The fourth proportional to 15,886.55, 21,921.10 and 8,813.03 is: 12,160.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,886.55 : 21,921.10 = 8,813.03 : x
  2. Step 2: Convert to fraction form
    15,886.55/21,921.10 = 8,813.03/x
  3. Step 3: Cross multiply
    15,886.55x = 21,921.10 × 8,813.03
  4. Step 4: Simplify right side
    15,886.55x = 193,191,180.29
  5. Step 5: Solve for x
    x = 193,191,180.29/15,886.55
  6. Step 6: Final answer
    x = 12,160.67

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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.