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Finding the Fourth Proportional to 123,603.60, 185,478.30 and 81,605.10

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Solution

The fourth proportional to 123,603.60, 185,478.30 and 81,605.10 is: 122,455.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,603.60 : 185,478.30 = 81,605.10 : x
  2. Step 2: Convert to fraction form
    123,603.60/185,478.30 = 81,605.10/x
  3. Step 3: Cross multiply
    123,603.60x = 185,478.30 × 81,605.10
  4. Step 4: Simplify right side
    123,603.60x = 15,135,975,219.33
  5. Step 5: Solve for x
    x = 15,135,975,219.33/123,603.60
  6. Step 6: Final answer
    x = 122,455.78

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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.