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Finding the Fourth Proportional to 13,758.88, 18,987.36 and 7,471.28

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Solution

The fourth proportional to 13,758.88, 18,987.36 and 7,471.28 is: 10,310.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,758.88 : 18,987.36 = 7,471.28 : x
  2. Step 2: Convert to fraction form
    13,758.88/18,987.36 = 7,471.28/x
  3. Step 3: Cross multiply
    13,758.88x = 18,987.36 × 7,471.28
  4. Step 4: Simplify right side
    13,758.88x = 141,859,883.02
  5. Step 5: Solve for x
    x = 141,859,883.02/13,758.88
  6. Step 6: Final answer
    x = 10,310.42

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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.