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Finding the Fourth Proportional to 100,984.77, 139,352.63 and 55,660.25

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Solution

The fourth proportional to 100,984.77, 139,352.63 and 55,660.25 is: 76,807.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,984.77 : 139,352.63 = 55,660.25 : x
  2. Step 2: Convert to fraction form
    100,984.77/139,352.63 = 55,660.25/x
  3. Step 3: Cross multiply
    100,984.77x = 139,352.63 × 55,660.25
  4. Step 4: Simplify right side
    100,984.77x = 7,756,401,248.89
  5. Step 5: Solve for x
    x = 7,756,401,248.89/100,984.77
  6. Step 6: Final answer
    x = 76,807.63

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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.