Home / 13,138.24-18,130.32-7,830.30

Finding the Fourth Proportional to 13,138.24, 18,130.32 and 7,830.30

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Solution

The fourth proportional to 13,138.24, 18,130.32 and 7,830.30 is: 10,805.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.24 : 18,130.32 = 7,830.30 : x
  2. Step 2: Convert to fraction form
    13,138.24/18,130.32 = 7,830.30/x
  3. Step 3: Cross multiply
    13,138.24x = 18,130.32 × 7,830.30
  4. Step 4: Simplify right side
    13,138.24x = 141,965,844.70
  5. Step 5: Solve for x
    x = 141,965,844.70/13,138.24
  6. Step 6: Final answer
    x = 10,805.55

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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.