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Finding the Fourth Proportional to 99,813.60, 149,720.40 and 89,972.10

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Solution

The fourth proportional to 99,813.60, 149,720.40 and 89,972.10 is: 134,958.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,813.60 : 149,720.40 = 89,972.10 : x
  2. Step 2: Convert to fraction form
    99,813.60/149,720.40 = 89,972.10/x
  3. Step 3: Cross multiply
    99,813.60x = 149,720.40 × 89,972.10
  4. Step 4: Simplify right side
    99,813.60x = 13,470,658,800.84
  5. Step 5: Solve for x
    x = 13,470,658,800.84/99,813.60
  6. Step 6: Final answer
    x = 134,958.15

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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.