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Finding the Fourth Proportional to 125,239.78, 172,830.90 and 68,649.94

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Solution

The fourth proportional to 125,239.78, 172,830.90 and 68,649.94 is: 94,736.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,239.78 : 172,830.90 = 68,649.94 : x
  2. Step 2: Convert to fraction form
    125,239.78/172,830.90 = 68,649.94/x
  3. Step 3: Cross multiply
    125,239.78x = 172,830.90 × 68,649.94
  4. Step 4: Simplify right side
    125,239.78x = 11,864,830,915.15
  5. Step 5: Solve for x
    x = 11,864,830,915.15/125,239.78
  6. Step 6: Final answer
    x = 94,736.92

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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.