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Finding the Fourth Proportional to 99,661.97, 149,563.01 and 90,133.40

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Solution

The fourth proportional to 99,661.97, 149,563.01 and 90,133.40 is: 135,263.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,661.97 : 149,563.01 = 90,133.40 : x
  2. Step 2: Convert to fraction form
    99,661.97/149,563.01 = 90,133.40/x
  3. Step 3: Cross multiply
    99,661.97x = 149,563.01 × 90,133.40
  4. Step 4: Simplify right side
    99,661.97x = 13,480,622,154.87
  5. Step 5: Solve for x
    x = 13,480,622,154.87/99,661.97
  6. Step 6: Final answer
    x = 135,263.45

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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.