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Finding the Fourth Proportional to 13,155.91, 18,154.87 and 7,187.60

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Solution

The fourth proportional to 13,155.91, 18,154.87 and 7,187.60 is: 9,918.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,155.91 : 18,154.87 = 7,187.60 : x
  2. Step 2: Convert to fraction form
    13,155.91/18,154.87 = 7,187.60/x
  3. Step 3: Cross multiply
    13,155.91x = 18,154.87 × 7,187.60
  4. Step 4: Simplify right side
    13,155.91x = 130,489,971.03
  5. Step 5: Solve for x
    x = 130,489,971.03/13,155.91
  6. Step 6: Final answer
    x = 9,918.74

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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.