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Finding the Fourth Proportional to 18,909.77, 28,361.00 and 7,220.21

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Solution

The fourth proportional to 18,909.77, 28,361.00 and 7,220.21 is: 10,828.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.77 : 28,361.00 = 7,220.21 : x
  2. Step 2: Convert to fraction form
    18,909.77/28,361.00 = 7,220.21/x
  3. Step 3: Cross multiply
    18,909.77x = 28,361.00 × 7,220.21
  4. Step 4: Simplify right side
    18,909.77x = 204,772,339.71
  5. Step 5: Solve for x
    x = 204,772,339.71/18,909.77
  6. Step 6: Final answer
    x = 10,828.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.