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Finding the Fourth Proportional to 18,518.76, 27,788.94 and 7,430.40

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Solution

The fourth proportional to 18,518.76, 27,788.94 and 7,430.40 is: 11,149.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,518.76 : 27,788.94 = 7,430.40 : x
  2. Step 2: Convert to fraction form
    18,518.76/27,788.94 = 7,430.40/x
  3. Step 3: Cross multiply
    18,518.76x = 27,788.94 × 7,430.40
  4. Step 4: Simplify right side
    18,518.76x = 206,482,939.78
  5. Step 5: Solve for x
    x = 206,482,939.78/18,518.76
  6. Step 6: Final answer
    x = 11,149.93

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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.