Home / 13,981.90-20,970.45-5,212.30

Finding the Fourth Proportional to 13,981.90, 20,970.45 and 5,212.30

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Solution

The fourth proportional to 13,981.90, 20,970.45 and 5,212.30 is: 7,817.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,981.90 : 20,970.45 = 5,212.30 : x
  2. Step 2: Convert to fraction form
    13,981.90/20,970.45 = 5,212.30/x
  3. Step 3: Cross multiply
    13,981.90x = 20,970.45 × 5,212.30
  4. Step 4: Simplify right side
    13,981.90x = 109,304,276.54
  5. Step 5: Solve for x
    x = 109,304,276.54/13,981.90
  6. Step 6: Final answer
    x = 7,817.56

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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.