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Finding the Fourth Proportional to 111,960, 154,504.80 and 61,659

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Solution

The fourth proportional to 111,960, 154,504.80 and 61,659 is: 85,089.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,960 : 154,504.80 = 61,659 : x
  2. Step 2: Convert to fraction form
    111,960/154,504.80 = 61,659/x
  3. Step 3: Cross multiply
    111,960x = 154,504.80 × 61,659
  4. Step 4: Simplify right side
    111,960x = 9,526,611,463.20
  5. Step 5: Solve for x
    x = 9,526,611,463.20/111,960
  6. Step 6: Final answer
    x = 85,089.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.