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Finding the Fourth Proportional to 20,666.72, 30,981.86 and 7,516.78

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Solution

The fourth proportional to 20,666.72, 30,981.86 and 7,516.78 is: 11,268.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,666.72 : 30,981.86 = 7,516.78 : x
  2. Step 2: Convert to fraction form
    20,666.72/30,981.86 = 7,516.78/x
  3. Step 3: Cross multiply
    20,666.72x = 30,981.86 × 7,516.78
  4. Step 4: Simplify right side
    20,666.72x = 232,883,825.61
  5. Step 5: Solve for x
    x = 232,883,825.61/20,666.72
  6. Step 6: Final answer
    x = 11,268.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.