Home / 13,156.80-18,155.61-7,187.28

Finding the Fourth Proportional to 13,156.80, 18,155.61 and 7,187.28

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Solution

The fourth proportional to 13,156.80, 18,155.61 and 7,187.28 is: 9,918.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,156.80 : 18,155.61 = 7,187.28 : x
  2. Step 2: Convert to fraction form
    13,156.80/18,155.61 = 7,187.28/x
  3. Step 3: Cross multiply
    13,156.80x = 18,155.61 × 7,187.28
  4. Step 4: Simplify right side
    13,156.80x = 130,489,452.64
  5. Step 5: Solve for x
    x = 130,489,452.64/13,156.80
  6. Step 6: Final answer
    x = 9,918.02

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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.