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Finding the Fourth Proportional to 99,656.80, 149,485.20 and 81,942.10

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Solution

The fourth proportional to 99,656.80, 149,485.20 and 81,942.10 is: 122,913.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,656.80 : 149,485.20 = 81,942.10 : x
  2. Step 2: Convert to fraction form
    99,656.80/149,485.20 = 81,942.10/x
  3. Step 3: Cross multiply
    99,656.80x = 149,485.20 × 81,942.10
  4. Step 4: Simplify right side
    99,656.80x = 12,249,131,206.92
  5. Step 5: Solve for x
    x = 12,249,131,206.92/99,656.80
  6. Step 6: Final answer
    x = 122,913.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.