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Finding the Fourth Proportional to 13,155.81, 18,155.07 and 7,187.57

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Solution

The fourth proportional to 13,155.81, 18,155.07 and 7,187.57 is: 9,918.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,155.81 : 18,155.07 = 7,187.57 : x
  2. Step 2: Convert to fraction form
    13,155.81/18,155.07 = 7,187.57/x
  3. Step 3: Cross multiply
    13,155.81x = 18,155.07 × 7,187.57
  4. Step 4: Simplify right side
    13,155.81x = 130,490,836.48
  5. Step 5: Solve for x
    x = 130,490,836.48/13,155.81
  6. Step 6: Final answer
    x = 9,918.88

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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.