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Finding the Fourth Proportional to 78,555, 108,405.90 and 45,021

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Solution

The fourth proportional to 78,555, 108,405.90 and 45,021 is: 62,128.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,555 : 108,405.90 = 45,021 : x
  2. Step 2: Convert to fraction form
    78,555/108,405.90 = 45,021/x
  3. Step 3: Cross multiply
    78,555x = 108,405.90 × 45,021
  4. Step 4: Simplify right side
    78,555x = 4,880,542,023.90
  5. Step 5: Solve for x
    x = 4,880,542,023.90/78,555
  6. Step 6: Final answer
    x = 62,128.98

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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.