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Finding the Fourth Proportional to 125,145, 172,701.72 and 68,558.40

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Solution

The fourth proportional to 125,145, 172,701.72 and 68,558.40 is: 94,611.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,145 : 172,701.72 = 68,558.40 : x
  2. Step 2: Convert to fraction form
    125,145/172,701.72 = 68,558.40/x
  3. Step 3: Cross multiply
    125,145x = 172,701.72 × 68,558.40
  4. Step 4: Simplify right side
    125,145x = 11,840,153,600.45
  5. Step 5: Solve for x
    x = 11,840,153,600.45/125,145
  6. Step 6: Final answer
    x = 94,611.48

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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.