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Finding the Fourth Proportional to 15,719.63, 21,693.69 and 8,645.90

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Solution

The fourth proportional to 15,719.63, 21,693.69 and 8,645.90 is: 11,931.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,719.63 : 21,693.69 = 8,645.90 : x
  2. Step 2: Convert to fraction form
    15,719.63/21,693.69 = 8,645.90/x
  3. Step 3: Cross multiply
    15,719.63x = 21,693.69 × 8,645.90
  4. Step 4: Simplify right side
    15,719.63x = 187,561,365.90
  5. Step 5: Solve for x
    x = 187,561,365.90/15,719.63
  6. Step 6: Final answer
    x = 11,931.67

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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.