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Finding the Fourth Proportional to 84,392.76, 126,422.16 and 68,615.40

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Solution

The fourth proportional to 84,392.76, 126,422.16 and 68,615.40 is: 102,787.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,392.76 : 126,422.16 = 68,615.40 : x
  2. Step 2: Convert to fraction form
    84,392.76/126,422.16 = 68,615.40/x
  3. Step 3: Cross multiply
    84,392.76x = 126,422.16 × 68,615.40
  4. Step 4: Simplify right side
    84,392.76x = 8,674,507,077.26
  5. Step 5: Solve for x
    x = 8,674,507,077.26/84,392.76
  6. Step 6: Final answer
    x = 102,787.34

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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.