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Finding the Fourth Proportional to 100,641.72, 138,885.60 and 55,322.64

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Solution

The fourth proportional to 100,641.72, 138,885.60 and 55,322.64 is: 76,345.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,641.72 : 138,885.60 = 55,322.64 : x
  2. Step 2: Convert to fraction form
    100,641.72/138,885.60 = 55,322.64/x
  3. Step 3: Cross multiply
    100,641.72x = 138,885.60 × 55,322.64
  4. Step 4: Simplify right side
    100,641.72x = 7,683,518,049.98
  5. Step 5: Solve for x
    x = 7,683,518,049.98/100,641.72
  6. Step 6: Final answer
    x = 76,345.26

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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.