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Finding the Fourth Proportional to 18,707.88, 25,817.94 and 11,152.20

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Solution

The fourth proportional to 18,707.88, 25,817.94 and 11,152.20 is: 15,390.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,707.88 : 25,817.94 = 11,152.20 : x
  2. Step 2: Convert to fraction form
    18,707.88/25,817.94 = 11,152.20/x
  3. Step 3: Cross multiply
    18,707.88x = 25,817.94 × 11,152.20
  4. Step 4: Simplify right side
    18,707.88x = 287,926,830.47
  5. Step 5: Solve for x
    x = 287,926,830.47/18,707.88
  6. Step 6: Final answer
    x = 15,390.67

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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.