Home / 13,140.72-18,134.08-7,172.36

Finding the Fourth Proportional to 13,140.72, 18,134.08 and 7,172.36

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Solution

The fourth proportional to 13,140.72, 18,134.08 and 7,172.36 is: 9,897.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.72 : 18,134.08 = 7,172.36 : x
  2. Step 2: Convert to fraction form
    13,140.72/18,134.08 = 7,172.36/x
  3. Step 3: Cross multiply
    13,140.72x = 18,134.08 × 7,172.36
  4. Step 4: Simplify right side
    13,140.72x = 130,064,150.03
  5. Step 5: Solve for x
    x = 130,064,150.03/13,140.72
  6. Step 6: Final answer
    x = 9,897.79

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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.