Home / 13,140.76-18,134.26-7,172.43

Finding the Fourth Proportional to 13,140.76, 18,134.26 and 7,172.43

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Solution

The fourth proportional to 13,140.76, 18,134.26 and 7,172.43 is: 9,897.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.76 : 18,134.26 = 7,172.43 : x
  2. Step 2: Convert to fraction form
    13,140.76/18,134.26 = 7,172.43/x
  3. Step 3: Cross multiply
    13,140.76x = 18,134.26 × 7,172.43
  4. Step 4: Simplify right side
    13,140.76x = 130,066,664.86
  5. Step 5: Solve for x
    x = 130,066,664.86/13,140.76
  6. Step 6: Final answer
    x = 9,897.96

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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.