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Finding the Fourth Proportional to 100,728.48, 139,002.48 and 55,406.43

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Solution

The fourth proportional to 100,728.48, 139,002.48 and 55,406.43 is: 76,459.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,728.48 : 139,002.48 = 55,406.43 : x
  2. Step 2: Convert to fraction form
    100,728.48/139,002.48 = 55,406.43/x
  3. Step 3: Cross multiply
    100,728.48x = 139,002.48 × 55,406.43
  4. Step 4: Simplify right side
    100,728.48x = 7,701,631,177.95
  5. Step 5: Solve for x
    x = 7,701,631,177.95/100,728.48
  6. Step 6: Final answer
    x = 76,459.32

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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.