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Finding the Fourth Proportional to 115,912.40, 173,643 and 85,462.07

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Solution

The fourth proportional to 115,912.40, 173,643 and 85,462.07 is: 128,026.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,912.40 : 173,643 = 85,462.07 : x
  2. Step 2: Convert to fraction form
    115,912.40/173,643 = 85,462.07/x
  3. Step 3: Cross multiply
    115,912.40x = 173,643 × 85,462.07
  4. Step 4: Simplify right side
    115,912.40x = 14,839,890,221.01
  5. Step 5: Solve for x
    x = 14,839,890,221.01/115,912.40
  6. Step 6: Final answer
    x = 128,026.77

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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.