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Finding the Fourth Proportional to 18,515.30, 27,748.65 and 7,412.90

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Solution

The fourth proportional to 18,515.30, 27,748.65 and 7,412.90 is: 11,109.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,515.30 : 27,748.65 = 7,412.90 : x
  2. Step 2: Convert to fraction form
    18,515.30/27,748.65 = 7,412.90/x
  3. Step 3: Cross multiply
    18,515.30x = 27,748.65 × 7,412.90
  4. Step 4: Simplify right side
    18,515.30x = 205,697,967.59
  5. Step 5: Solve for x
    x = 205,697,967.59/18,515.30
  6. Step 6: Final answer
    x = 11,109.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.