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Finding the Fourth Proportional to 13,216, 19,831.68 and 5,920

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Solution

The fourth proportional to 13,216, 19,831.68 and 5,920 is: 8,883.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,216 : 19,831.68 = 5,920 : x
  2. Step 2: Convert to fraction form
    13,216/19,831.68 = 5,920/x
  3. Step 3: Cross multiply
    13,216x = 19,831.68 × 5,920
  4. Step 4: Simplify right side
    13,216x = 117,403,545.60
  5. Step 5: Solve for x
    x = 117,403,545.60/13,216
  6. Step 6: Final answer
    x = 8,883.44

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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.