Home / 13,135.89-18,120.78-8,887.14

Finding the Fourth Proportional to 13,135.89, 18,120.78 and 8,887.14

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Solution

The fourth proportional to 13,135.89, 18,120.78 and 8,887.14 is: 12,259.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,135.89 : 18,120.78 = 8,887.14 : x
  2. Step 2: Convert to fraction form
    13,135.89/18,120.78 = 8,887.14/x
  3. Step 3: Cross multiply
    13,135.89x = 18,120.78 × 8,887.14
  4. Step 4: Simplify right side
    13,135.89x = 161,041,908.77
  5. Step 5: Solve for x
    x = 161,041,908.77/13,135.89
  6. Step 6: Final answer
    x = 12,259.69

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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.