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Finding the Fourth Proportional to 20,878.69, 28,812.69 and 12,495.19

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Solution

The fourth proportional to 20,878.69, 28,812.69 and 12,495.19 is: 17,243.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.69 : 28,812.69 = 12,495.19 : x
  2. Step 2: Convert to fraction form
    20,878.69/28,812.69 = 12,495.19/x
  3. Step 3: Cross multiply
    20,878.69x = 28,812.69 × 12,495.19
  4. Step 4: Simplify right side
    20,878.69x = 360,020,035.96
  5. Step 5: Solve for x
    x = 360,020,035.96/20,878.69
  6. Step 6: Final answer
    x = 17,243.42

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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.