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Finding the Fourth Proportional to 21,039.66, 28,975.66 and 20,580.39

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Solution

The fourth proportional to 21,039.66, 28,975.66 and 20,580.39 is: 28,343.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,039.66 : 28,975.66 = 20,580.39 : x
  2. Step 2: Convert to fraction form
    21,039.66/28,975.66 = 20,580.39/x
  3. Step 3: Cross multiply
    21,039.66x = 28,975.66 × 20,580.39
  4. Step 4: Simplify right side
    21,039.66x = 596,330,331.86
  5. Step 5: Solve for x
    x = 596,330,331.86/21,039.66
  6. Step 6: Final answer
    x = 28,343.15

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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.