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Finding the Fourth Proportional to 100,718.98, 138,989.01 and 55,396.66

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Solution

The fourth proportional to 100,718.98, 138,989.01 and 55,396.66 is: 76,445.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,718.98 : 138,989.01 = 55,396.66 : x
  2. Step 2: Convert to fraction form
    100,718.98/138,989.01 = 55,396.66/x
  3. Step 3: Cross multiply
    100,718.98x = 138,989.01 × 55,396.66
  4. Step 4: Simplify right side
    100,718.98x = 7,699,526,930.71
  5. Step 5: Solve for x
    x = 7,699,526,930.71/100,718.98
  6. Step 6: Final answer
    x = 76,445.64

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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.