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Finding the Fourth Proportional to 11,420.64, 17,118 and 4,842.72

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Solution

The fourth proportional to 11,420.64, 17,118 and 4,842.72 is: 7,258.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,420.64 : 17,118 = 4,842.72 : x
  2. Step 2: Convert to fraction form
    11,420.64/17,118 = 4,842.72/x
  3. Step 3: Cross multiply
    11,420.64x = 17,118 × 4,842.72
  4. Step 4: Simplify right side
    11,420.64x = 82,897,680.96
  5. Step 5: Solve for x
    x = 82,897,680.96/11,420.64
  6. Step 6: Final answer
    x = 7,258.58

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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.