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Finding the Fourth Proportional to 20,361.20, 30,547.20 and 7,212.20

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Solution

The fourth proportional to 20,361.20, 30,547.20 and 7,212.20 is: 10,820.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,361.20 : 30,547.20 = 7,212.20 : x
  2. Step 2: Convert to fraction form
    20,361.20/30,547.20 = 7,212.20/x
  3. Step 3: Cross multiply
    20,361.20x = 30,547.20 × 7,212.20
  4. Step 4: Simplify right side
    20,361.20x = 220,312,515.84
  5. Step 5: Solve for x
    x = 220,312,515.84/20,361.20
  6. Step 6: Final answer
    x = 10,820.21

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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.