Home / 20,619.81-28,454.51-11,188.17

Finding the Fourth Proportional to 20,619.81, 28,454.51 and 11,188.17

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Solution

The fourth proportional to 20,619.81, 28,454.51 and 11,188.17 is: 15,439.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,619.81 : 28,454.51 = 11,188.17 : x
  2. Step 2: Convert to fraction form
    20,619.81/28,454.51 = 11,188.17/x
  3. Step 3: Cross multiply
    20,619.81x = 28,454.51 × 11,188.17
  4. Step 4: Simplify right side
    20,619.81x = 318,353,839.21
  5. Step 5: Solve for x
    x = 318,353,839.21/20,619.81
  6. Step 6: Final answer
    x = 15,439.22

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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.