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Finding the Fourth Proportional to 13,758.80, 18,987.08 and 7,471.12

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Solution

The fourth proportional to 13,758.80, 18,987.08 and 7,471.12 is: 10,310.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,758.80 : 18,987.08 = 7,471.12 : x
  2. Step 2: Convert to fraction form
    13,758.80/18,987.08 = 7,471.12/x
  3. Step 3: Cross multiply
    13,758.80x = 18,987.08 × 7,471.12
  4. Step 4: Simplify right side
    13,758.80x = 141,854,753.13
  5. Step 5: Solve for x
    x = 141,854,753.13/13,758.80
  6. Step 6: Final answer
    x = 10,310.11

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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.