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Finding the Fourth Proportional to 122,561.64, 169,133.76 and 68,113.50

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Solution

The fourth proportional to 122,561.64, 169,133.76 and 68,113.50 is: 93,995.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,561.64 : 169,133.76 = 68,113.50 : x
  2. Step 2: Convert to fraction form
    122,561.64/169,133.76 = 68,113.50/x
  3. Step 3: Cross multiply
    122,561.64x = 169,133.76 × 68,113.50
  4. Step 4: Simplify right side
    122,561.64x = 11,520,292,361.76
  5. Step 5: Solve for x
    x = 11,520,292,361.76/122,561.64
  6. Step 6: Final answer
    x = 93,995.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.