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Finding the Fourth Proportional to 78,489.40, 108,309.72 and 44,498.56

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Solution

The fourth proportional to 78,489.40, 108,309.72 and 44,498.56 is: 61,404.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,489.40 : 108,309.72 = 44,498.56 : x
  2. Step 2: Convert to fraction form
    78,489.40/108,309.72 = 44,498.56/x
  3. Step 3: Cross multiply
    78,489.40x = 108,309.72 × 44,498.56
  4. Step 4: Simplify right side
    78,489.40x = 4,819,626,574.00
  5. Step 5: Solve for x
    x = 4,819,626,574.00/78,489.40
  6. Step 6: Final answer
    x = 61,404.81

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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.