Home / 11,139.12-15,378.48-9,644.67

Finding the Fourth Proportional to 11,139.12, 15,378.48 and 9,644.67

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Solution

The fourth proportional to 11,139.12, 15,378.48 and 9,644.67 is: 13,315.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,139.12 : 15,378.48 = 9,644.67 : x
  2. Step 2: Convert to fraction form
    11,139.12/15,378.48 = 9,644.67/x
  3. Step 3: Cross multiply
    11,139.12x = 15,378.48 × 9,644.67
  4. Step 4: Simplify right side
    11,139.12x = 148,320,364.70
  5. Step 5: Solve for x
    x = 148,320,364.70/11,139.12
  6. Step 6: Final answer
    x = 13,315.27

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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.