Home / 13,688.02-18,885.90-8,380.90

Finding the Fourth Proportional to 13,688.02, 18,885.90 and 8,380.90

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Solution

The fourth proportional to 13,688.02, 18,885.90 and 8,380.90 is: 11,563.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.02 : 18,885.90 = 8,380.90 : x
  2. Step 2: Convert to fraction form
    13,688.02/18,885.90 = 8,380.90/x
  3. Step 3: Cross multiply
    13,688.02x = 18,885.90 × 8,380.90
  4. Step 4: Simplify right side
    13,688.02x = 158,280,839.31
  5. Step 5: Solve for x
    x = 158,280,839.31/13,688.02
  6. Step 6: Final answer
    x = 11,563.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.