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Finding the Fourth Proportional to 545,181.12, 817,939.10 and 279,128.45

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Solution

The fourth proportional to 545,181.12, 817,939.10 and 279,128.45 is: 418,778.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    545,181.12 : 817,939.10 = 279,128.45 : x
  2. Step 2: Convert to fraction form
    545,181.12/817,939.10 = 279,128.45/x
  3. Step 3: Cross multiply
    545,181.12x = 817,939.10 × 279,128.45
  4. Step 4: Simplify right side
    545,181.12x = 228,310,073,177.40
  5. Step 5: Solve for x
    x = 228,310,073,177.40/545,181.12
  6. Step 6: Final answer
    x = 418,778.39

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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.