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Finding the Fourth Proportional to 21,157.79, 29,199.80 and 11,728.67

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Solution

The fourth proportional to 21,157.79, 29,199.80 and 11,728.67 is: 16,186.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,157.79 : 29,199.80 = 11,728.67 : x
  2. Step 2: Convert to fraction form
    21,157.79/29,199.80 = 11,728.67/x
  3. Step 3: Cross multiply
    21,157.79x = 29,199.80 × 11,728.67
  4. Step 4: Simplify right side
    21,157.79x = 342,474,818.27
  5. Step 5: Solve for x
    x = 342,474,818.27/21,157.79
  6. Step 6: Final answer
    x = 16,186.70

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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.