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Finding the Fourth Proportional to 262,938.40, 394,465.20 and 85,415.20

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Solution

The fourth proportional to 262,938.40, 394,465.20 and 85,415.20 is: 128,141.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    262,938.40 : 394,465.20 = 85,415.20 : x
  2. Step 2: Convert to fraction form
    262,938.40/394,465.20 = 85,415.20/x
  3. Step 3: Cross multiply
    262,938.40x = 394,465.20 × 85,415.20
  4. Step 4: Simplify right side
    262,938.40x = 33,693,323,951.04
  5. Step 5: Solve for x
    x = 33,693,323,951.04/262,938.40
  6. Step 6: Final answer
    x = 128,141.51

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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.