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Finding the Fourth Proportional to 13,156.15, 18,154.92 and 7,187.53

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Solution

The fourth proportional to 13,156.15, 18,154.92 and 7,187.53 is: 9,918.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,156.15 : 18,154.92 = 7,187.53 : x
  2. Step 2: Convert to fraction form
    13,156.15/18,154.92 = 7,187.53/x
  3. Step 3: Cross multiply
    13,156.15x = 18,154.92 × 7,187.53
  4. Step 4: Simplify right side
    13,156.15x = 130,489,032.15
  5. Step 5: Solve for x
    x = 130,489,032.15/13,156.15
  6. Step 6: Final answer
    x = 9,918.48

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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.