Home / 13,938.40-20,875.20-8,689.60

Finding the Fourth Proportional to 13,938.40, 20,875.20 and 8,689.60

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Solution

The fourth proportional to 13,938.40, 20,875.20 and 8,689.60 is: 13,014.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,938.40 : 20,875.20 = 8,689.60 : x
  2. Step 2: Convert to fraction form
    13,938.40/20,875.20 = 8,689.60/x
  3. Step 3: Cross multiply
    13,938.40x = 20,875.20 × 8,689.60
  4. Step 4: Simplify right side
    13,938.40x = 181,397,137.92
  5. Step 5: Solve for x
    x = 181,397,137.92/13,938.40
  6. Step 6: Final answer
    x = 13,014.20

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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.