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Finding the Fourth Proportional to 17,918.74, 26,878.16 and 5,438.86

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Solution

The fourth proportional to 17,918.74, 26,878.16 and 5,438.86 is: 8,158.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,918.74 : 26,878.16 = 5,438.86 : x
  2. Step 2: Convert to fraction form
    17,918.74/26,878.16 = 5,438.86/x
  3. Step 3: Cross multiply
    17,918.74x = 26,878.16 × 5,438.86
  4. Step 4: Simplify right side
    17,918.74x = 146,186,549.30
  5. Step 5: Solve for x
    x = 146,186,549.30/17,918.74
  6. Step 6: Final answer
    x = 8,158.31

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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.