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Finding the Fourth Proportional to 13,929.68, 21,018.74 and 13,389.68

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Solution

The fourth proportional to 13,929.68, 21,018.74 and 13,389.68 is: 20,203.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,929.68 : 21,018.74 = 13,389.68 : x
  2. Step 2: Convert to fraction form
    13,929.68/21,018.74 = 13,389.68/x
  3. Step 3: Cross multiply
    13,929.68x = 21,018.74 × 13,389.68
  4. Step 4: Simplify right side
    13,929.68x = 281,434,202.60
  5. Step 5: Solve for x
    x = 281,434,202.60/13,929.68
  6. Step 6: Final answer
    x = 20,203.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.