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Finding the Fourth Proportional to 256,124.78, 384,244.26 and 78,649.72

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Solution

The fourth proportional to 256,124.78, 384,244.26 and 78,649.72 is: 117,992.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,124.78 : 384,244.26 = 78,649.72 : x
  2. Step 2: Convert to fraction form
    256,124.78/384,244.26 = 78,649.72/x
  3. Step 3: Cross multiply
    256,124.78x = 384,244.26 × 78,649.72
  4. Step 4: Simplify right side
    256,124.78x = 30,220,703,460.61
  5. Step 5: Solve for x
    x = 30,220,703,460.61/256,124.78
  6. Step 6: Final answer
    x = 117,992.11

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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.