Home / 13,721.50-18,938.78-7,756.63

Finding the Fourth Proportional to 13,721.50, 18,938.78 and 7,756.63

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Solution

The fourth proportional to 13,721.50, 18,938.78 and 7,756.63 is: 10,705.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,721.50 : 18,938.78 = 7,756.63 : x
  2. Step 2: Convert to fraction form
    13,721.50/18,938.78 = 7,756.63/x
  3. Step 3: Cross multiply
    13,721.50x = 18,938.78 × 7,756.63
  4. Step 4: Simplify right side
    13,721.50x = 146,901,052.07
  5. Step 5: Solve for x
    x = 146,901,052.07/13,721.50
  6. Step 6: Final answer
    x = 10,705.90

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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.