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Finding the Fourth Proportional to 78,300.09, 108,053.19 and 42,489.81

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Solution

The fourth proportional to 78,300.09, 108,053.19 and 42,489.81 is: 58,635.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,300.09 : 108,053.19 = 42,489.81 : x
  2. Step 2: Convert to fraction form
    78,300.09/108,053.19 = 42,489.81/x
  3. Step 3: Cross multiply
    78,300.09x = 108,053.19 × 42,489.81
  4. Step 4: Simplify right side
    78,300.09x = 4,591,159,512.99
  5. Step 5: Solve for x
    x = 4,591,159,512.99/78,300.09
  6. Step 6: Final answer
    x = 58,635.43

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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.