Home / 81,778.10-122,671.20-42,412.10

Finding the Fourth Proportional to 81,778.10, 122,671.20 and 42,412.10

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Solution

The fourth proportional to 81,778.10, 122,671.20 and 42,412.10 is: 63,620.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,778.10 : 122,671.20 = 42,412.10 : x
  2. Step 2: Convert to fraction form
    81,778.10/122,671.20 = 42,412.10/x
  3. Step 3: Cross multiply
    81,778.10x = 122,671.20 × 42,412.10
  4. Step 4: Simplify right side
    81,778.10x = 5,202,743,201.52
  5. Step 5: Solve for x
    x = 5,202,743,201.52/81,778.10
  6. Step 6: Final answer
    x = 63,620.25

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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.