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Finding the Fourth Proportional to 427,811.60, 640,939.80 and 261,405.20

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Solution

The fourth proportional to 427,811.60, 640,939.80 and 261,405.20 is: 391,632.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,811.60 : 640,939.80 = 261,405.20 : x
  2. Step 2: Convert to fraction form
    427,811.60/640,939.80 = 261,405.20/x
  3. Step 3: Cross multiply
    427,811.60x = 640,939.80 × 261,405.20
  4. Step 4: Simplify right side
    427,811.60x = 167,544,996,606.96
  5. Step 5: Solve for x
    x = 167,544,996,606.96/427,811.60
  6. Step 6: Final answer
    x = 391,632.66

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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.