Home / 13,140.64-18,129.68-8,172.32

Finding the Fourth Proportional to 13,140.64, 18,129.68 and 8,172.32

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Solution

The fourth proportional to 13,140.64, 18,129.68 and 8,172.32 is: 11,275.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.64 : 18,129.68 = 8,172.32 : x
  2. Step 2: Convert to fraction form
    13,140.64/18,129.68 = 8,172.32/x
  3. Step 3: Cross multiply
    13,140.64x = 18,129.68 × 8,172.32
  4. Step 4: Simplify right side
    13,140.64x = 148,161,546.46
  5. Step 5: Solve for x
    x = 148,161,546.46/13,140.64
  6. Step 6: Final answer
    x = 11,275.06

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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.