Home / 13,139.24-18,138.84-10,148.36

Finding the Fourth Proportional to 13,139.24, 18,138.84 and 10,148.36

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Solution

The fourth proportional to 13,139.24, 18,138.84 and 10,148.36 is: 14,009.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.24 : 18,138.84 = 10,148.36 : x
  2. Step 2: Convert to fraction form
    13,139.24/18,138.84 = 10,148.36/x
  3. Step 3: Cross multiply
    13,139.24x = 18,138.84 × 10,148.36
  4. Step 4: Simplify right side
    13,139.24x = 184,079,478.30
  5. Step 5: Solve for x
    x = 184,079,478.30/13,139.24
  6. Step 6: Final answer
    x = 14,009.90

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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.