Home / 13,145.25-18,142.11-8,678.31

Finding the Fourth Proportional to 13,145.25, 18,142.11 and 8,678.31

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Solution

The fourth proportional to 13,145.25, 18,142.11 and 8,678.31 is: 11,977.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,145.25 : 18,142.11 = 8,678.31 : x
  2. Step 2: Convert to fraction form
    13,145.25/18,142.11 = 8,678.31/x
  3. Step 3: Cross multiply
    13,145.25x = 18,142.11 × 8,678.31
  4. Step 4: Simplify right side
    13,145.25x = 157,442,854.63
  5. Step 5: Solve for x
    x = 157,442,854.63/13,145.25
  6. Step 6: Final answer
    x = 11,977.17

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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.