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Finding the Fourth Proportional to 125,000.64, 172,505.28 and 68,412

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Solution

The fourth proportional to 125,000.64, 172,505.28 and 68,412 is: 94,410.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,000.64 : 172,505.28 = 68,412 : x
  2. Step 2: Convert to fraction form
    125,000.64/172,505.28 = 68,412/x
  3. Step 3: Cross multiply
    125,000.64x = 172,505.28 × 68,412
  4. Step 4: Simplify right side
    125,000.64x = 11,801,431,215.36
  5. Step 5: Solve for x
    x = 11,801,431,215.36/125,000.64
  6. Step 6: Final answer
    x = 94,410.97

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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.