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Finding the Fourth Proportional to 18,425.76, 25,419.48 and 12,455.28

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Solution

The fourth proportional to 18,425.76, 25,419.48 and 12,455.28 is: 17,182.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,425.76 : 25,419.48 = 12,455.28 : x
  2. Step 2: Convert to fraction form
    18,425.76/25,419.48 = 12,455.28/x
  3. Step 3: Cross multiply
    18,425.76x = 25,419.48 × 12,455.28
  4. Step 4: Simplify right side
    18,425.76x = 316,606,740.85
  5. Step 5: Solve for x
    x = 316,606,740.85/18,425.76
  6. Step 6: Final answer
    x = 17,182.83

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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.