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Finding the Fourth Proportional to 100,810.29, 139,117.11 and 55,487.30

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Solution

The fourth proportional to 100,810.29, 139,117.11 and 55,487.30 is: 76,571.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,810.29 : 139,117.11 = 55,487.30 : x
  2. Step 2: Convert to fraction form
    100,810.29/139,117.11 = 55,487.30/x
  3. Step 3: Cross multiply
    100,810.29x = 139,117.11 × 55,487.30
  4. Step 4: Simplify right side
    100,810.29x = 7,719,232,122.12
  5. Step 5: Solve for x
    x = 7,719,232,122.12/100,810.29
  6. Step 6: Final answer
    x = 76,571.87

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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.