Home / 13,639.28-18,820.26-7,670.72

Finding the Fourth Proportional to 13,639.28, 18,820.26 and 7,670.72

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Solution

The fourth proportional to 13,639.28, 18,820.26 and 7,670.72 is: 10,584.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639.28 : 18,820.26 = 7,670.72 : x
  2. Step 2: Convert to fraction form
    13,639.28/18,820.26 = 7,670.72/x
  3. Step 3: Cross multiply
    13,639.28x = 18,820.26 × 7,670.72
  4. Step 4: Simplify right side
    13,639.28x = 144,364,944.79
  5. Step 5: Solve for x
    x = 144,364,944.79/13,639.28
  6. Step 6: Final answer
    x = 10,584.50

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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.