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Finding the Fourth Proportional to 20,911.64, 28,854.65 and 11,957.69

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Solution

The fourth proportional to 20,911.64, 28,854.65 and 11,957.69 is: 16,499.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.64 : 28,854.65 = 11,957.69 : x
  2. Step 2: Convert to fraction form
    20,911.64/28,854.65 = 11,957.69/x
  3. Step 3: Cross multiply
    20,911.64x = 28,854.65 × 11,957.69
  4. Step 4: Simplify right side
    20,911.64x = 345,035,061.79
  5. Step 5: Solve for x
    x = 345,035,061.79/20,911.64
  6. Step 6: Final answer
    x = 16,499.67

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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.