Home / 13,128.57-18,117-7,160.36

Finding the Fourth Proportional to 13,128.57, 18,117 and 7,160.36

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Solution

The fourth proportional to 13,128.57, 18,117 and 7,160.36 is: 9,881.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.57 : 18,117 = 7,160.36 : x
  2. Step 2: Convert to fraction form
    13,128.57/18,117 = 7,160.36/x
  3. Step 3: Cross multiply
    13,128.57x = 18,117 × 7,160.36
  4. Step 4: Simplify right side
    13,128.57x = 129,724,151.54
  5. Step 5: Solve for x
    x = 129,724,151.54/13,128.57
  6. Step 6: Final answer
    x = 9,881.06

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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.