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Finding the Fourth Proportional to 100,750.64, 139,035.88 and 55,427.65

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Solution

The fourth proportional to 100,750.64, 139,035.88 and 55,427.65 is: 76,490.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,750.64 : 139,035.88 = 55,427.65 : x
  2. Step 2: Convert to fraction form
    100,750.64/139,035.88 = 55,427.65/x
  3. Step 3: Cross multiply
    100,750.64x = 139,035.88 × 55,427.65
  4. Step 4: Simplify right side
    100,750.64x = 7,706,431,815.78
  5. Step 5: Solve for x
    x = 7,706,431,815.78/100,750.64
  6. Step 6: Final answer
    x = 76,490.15

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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.