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Finding the Fourth Proportional to 13,011, 19,518.96 and 5,220.42

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Solution

The fourth proportional to 13,011, 19,518.96 and 5,220.42 is: 7,831.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,011 : 19,518.96 = 5,220.42 : x
  2. Step 2: Convert to fraction form
    13,011/19,518.96 = 5,220.42/x
  3. Step 3: Cross multiply
    13,011x = 19,518.96 × 5,220.42
  4. Step 4: Simplify right side
    13,011x = 101,897,169.16
  5. Step 5: Solve for x
    x = 101,897,169.16/13,011
  6. Step 6: Final answer
    x = 7,831.62

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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.