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Finding the Fourth Proportional to 119,409.60, 164,778.70 and 65,685.88

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Solution

The fourth proportional to 119,409.60, 164,778.70 and 65,685.88 is: 90,642.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    119,409.60 : 164,778.70 = 65,685.88 : x
  2. Step 2: Convert to fraction form
    119,409.60/164,778.70 = 65,685.88/x
  3. Step 3: Cross multiply
    119,409.60x = 164,778.70 × 65,685.88
  4. Step 4: Simplify right side
    119,409.60x = 10,823,633,914.76
  5. Step 5: Solve for x
    x = 10,823,633,914.76/119,409.60
  6. Step 6: Final answer
    x = 90,642.91

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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.