Home / 13,128.40-18,116.90-7,160.08

Finding the Fourth Proportional to 13,128.40, 18,116.90 and 7,160.08

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Solution

The fourth proportional to 13,128.40, 18,116.90 and 7,160.08 is: 9,880.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.40 : 18,116.90 = 7,160.08 : x
  2. Step 2: Convert to fraction form
    13,128.40/18,116.90 = 7,160.08/x
  3. Step 3: Cross multiply
    13,128.40x = 18,116.90 × 7,160.08
  4. Step 4: Simplify right side
    13,128.40x = 129,718,453.35
  5. Step 5: Solve for x
    x = 129,718,453.35/13,128.40
  6. Step 6: Final answer
    x = 9,880.75

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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.