Home / 13,289.13-18,339.21-7,320.78

Finding the Fourth Proportional to 13,289.13, 18,339.21 and 7,320.78

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Solution

The fourth proportional to 13,289.13, 18,339.21 and 7,320.78 is: 10,102.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,289.13 : 18,339.21 = 7,320.78 : x
  2. Step 2: Convert to fraction form
    13,289.13/18,339.21 = 7,320.78/x
  3. Step 3: Cross multiply
    13,289.13x = 18,339.21 × 7,320.78
  4. Step 4: Simplify right side
    13,289.13x = 134,257,321.78
  5. Step 5: Solve for x
    x = 134,257,321.78/13,289.13
  6. Step 6: Final answer
    x = 10,102.79

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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.