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Finding the Fourth Proportional to 99,137.67, 148,706.60 and 81,570.57

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Solution

The fourth proportional to 99,137.67, 148,706.60 and 81,570.57 is: 122,355.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,137.67 : 148,706.60 = 81,570.57 : x
  2. Step 2: Convert to fraction form
    99,137.67/148,706.60 = 81,570.57/x
  3. Step 3: Cross multiply
    99,137.67x = 148,706.60 × 81,570.57
  4. Step 4: Simplify right side
    99,137.67x = 12,130,081,716.91
  5. Step 5: Solve for x
    x = 12,130,081,716.91/99,137.67
  6. Step 6: Final answer
    x = 122,355.93

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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.