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Finding the Fourth Proportional to 18,707.76, 25,815.24 and 11,153.52

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Solution

The fourth proportional to 18,707.76, 25,815.24 and 11,153.52 is: 15,390.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,707.76 : 25,815.24 = 11,153.52 : x
  2. Step 2: Convert to fraction form
    18,707.76/25,815.24 = 11,153.52/x
  3. Step 3: Cross multiply
    18,707.76x = 25,815.24 × 11,153.52
  4. Step 4: Simplify right side
    18,707.76x = 287,930,795.64
  5. Step 5: Solve for x
    x = 287,930,795.64/18,707.76
  6. Step 6: Final answer
    x = 15,390.98

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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.