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Finding the Fourth Proportional to 100,999.68, 139,380.53 and 55,679.30

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Solution

The fourth proportional to 100,999.68, 139,380.53 and 55,679.30 is: 76,837.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,999.68 : 139,380.53 = 55,679.30 : x
  2. Step 2: Convert to fraction form
    100,999.68/139,380.53 = 55,679.30/x
  3. Step 3: Cross multiply
    100,999.68x = 139,380.53 × 55,679.30
  4. Step 4: Simplify right side
    100,999.68x = 7,760,609,368.73
  5. Step 5: Solve for x
    x = 7,760,609,368.73/100,999.68
  6. Step 6: Final answer
    x = 76,837.96

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1.5x scale

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.