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Finding the Fourth Proportional to 169,783.70, 254,489.55 and 85,409.30

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Solution

The fourth proportional to 169,783.70, 254,489.55 and 85,409.30 is: 128,020.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    169,783.70 : 254,489.55 = 85,409.30 : x
  2. Step 2: Convert to fraction form
    169,783.70/254,489.55 = 85,409.30/x
  3. Step 3: Cross multiply
    169,783.70x = 254,489.55 × 85,409.30
  4. Step 4: Simplify right side
    169,783.70x = 21,735,774,322.82
  5. Step 5: Solve for x
    x = 21,735,774,322.82/169,783.70
  6. Step 6: Final answer
    x = 128,020.38

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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.