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Finding the Fourth Proportional to 427,303.09, 640,752.67 and 127,679.05

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Solution

The fourth proportional to 427,303.09, 640,752.67 and 127,679.05 is: 191,458.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,303.09 : 640,752.67 = 127,679.05 : x
  2. Step 2: Convert to fraction form
    427,303.09/640,752.67 = 127,679.05/x
  3. Step 3: Cross multiply
    427,303.09x = 640,752.67 × 127,679.05
  4. Step 4: Simplify right side
    427,303.09x = 81,810,692,190.56
  5. Step 5: Solve for x
    x = 81,810,692,190.56/427,303.09
  6. Step 6: Final answer
    x = 191,458.23

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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.