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Finding the Fourth Proportional to 21,666.72, 32,480.64 and 7,812.48

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Solution

The fourth proportional to 21,666.72, 32,480.64 and 7,812.48 is: 11,711.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,666.72 : 32,480.64 = 7,812.48 : x
  2. Step 2: Convert to fraction form
    21,666.72/32,480.64 = 7,812.48/x
  3. Step 3: Cross multiply
    21,666.72x = 32,480.64 × 7,812.48
  4. Step 4: Simplify right side
    21,666.72x = 253,754,350.39
  5. Step 5: Solve for x
    x = 253,754,350.39/21,666.72
  6. Step 6: Final answer
    x = 11,711.71

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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.