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Finding the Fourth Proportional to 13,888.80, 19,164.24 and 7,920.90

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Solution

The fourth proportional to 13,888.80, 19,164.24 and 7,920.90 is: 10,929.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,888.80 : 19,164.24 = 7,920.90 : x
  2. Step 2: Convert to fraction form
    13,888.80/19,164.24 = 7,920.90/x
  3. Step 3: Cross multiply
    13,888.80x = 19,164.24 × 7,920.90
  4. Step 4: Simplify right side
    13,888.80x = 151,798,028.62
  5. Step 5: Solve for x
    x = 151,798,028.62/13,888.80
  6. Step 6: Final answer
    x = 10,929.53

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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.