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Finding the Fourth Proportional to 92,908.85, 128,267.40 and 61,170

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Solution

The fourth proportional to 92,908.85, 128,267.40 and 61,170 is: 84,449.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,908.85 : 128,267.40 = 61,170 : x
  2. Step 2: Convert to fraction form
    92,908.85/128,267.40 = 61,170/x
  3. Step 3: Cross multiply
    92,908.85x = 128,267.40 × 61,170
  4. Step 4: Simplify right side
    92,908.85x = 7,846,116,858
  5. Step 5: Solve for x
    x = 7,846,116,858/92,908.85
  6. Step 6: Final answer
    x = 84,449.62

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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.