Home / 13,140.79-18,134.28-7,172.44

Finding the Fourth Proportional to 13,140.79, 18,134.28 and 7,172.44

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Solution

The fourth proportional to 13,140.79, 18,134.28 and 7,172.44 is: 9,897.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.79 : 18,134.28 = 7,172.44 : x
  2. Step 2: Convert to fraction form
    13,140.79/18,134.28 = 7,172.44/x
  3. Step 3: Cross multiply
    13,140.79x = 18,134.28 × 7,172.44
  4. Step 4: Simplify right side
    13,140.79x = 130,066,989.91
  5. Step 5: Solve for x
    x = 130,066,989.91/13,140.79
  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.