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Finding the Fourth Proportional to 426,832.70, 640,281.45 and 127,289.90

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Solution

The fourth proportional to 426,832.70, 640,281.45 and 127,289.90 is: 190,944.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,832.70 : 640,281.45 = 127,289.90 : x
  2. Step 2: Convert to fraction form
    426,832.70/640,281.45 = 127,289.90/x
  3. Step 3: Cross multiply
    426,832.70x = 640,281.45 × 127,289.90
  4. Step 4: Simplify right side
    426,832.70x = 81,501,361,742.36
  5. Step 5: Solve for x
    x = 81,501,361,742.36/426,832.70
  6. Step 6: Final answer
    x = 190,944.51

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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.