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Finding the Fourth Proportional to 13,954.40, 20,931.60 and 12,885.20

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Solution

The fourth proportional to 13,954.40, 20,931.60 and 12,885.20 is: 19,327.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,954.40 : 20,931.60 = 12,885.20 : x
  2. Step 2: Convert to fraction form
    13,954.40/20,931.60 = 12,885.20/x
  3. Step 3: Cross multiply
    13,954.40x = 20,931.60 × 12,885.20
  4. Step 4: Simplify right side
    13,954.40x = 269,707,852.32
  5. Step 5: Solve for x
    x = 269,707,852.32/13,954.40
  6. Step 6: Final answer
    x = 19,327.80

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1.5x scale

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.