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Finding the Fourth Proportional to 78,444.90, 108,199.21 and 51,578.82

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Solution

The fourth proportional to 78,444.90, 108,199.21 and 51,578.82 is: 71,142.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,444.90 : 108,199.21 = 51,578.82 : x
  2. Step 2: Convert to fraction form
    78,444.90/108,199.21 = 51,578.82/x
  3. Step 3: Cross multiply
    78,444.90x = 108,199.21 × 51,578.82
  4. Step 4: Simplify right side
    78,444.90x = 5,580,787,576.73
  5. Step 5: Solve for x
    x = 5,580,787,576.73/78,444.90
  6. Step 6: Final answer
    x = 71,142.77

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1.5x scale

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.