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Finding the Fourth Proportional to 100,644.72, 138,889.74 and 55,325.64

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Solution

The fourth proportional to 100,644.72, 138,889.74 and 55,325.64 is: 76,349.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,644.72 : 138,889.74 = 55,325.64 : x
  2. Step 2: Convert to fraction form
    100,644.72/138,889.74 = 55,325.64/x
  3. Step 3: Cross multiply
    100,644.72x = 138,889.74 × 55,325.64
  4. Step 4: Simplify right side
    100,644.72x = 7,684,163,754.93
  5. Step 5: Solve for x
    x = 7,684,163,754.93/100,644.72
  6. Step 6: Final answer
    x = 76,349.40

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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.