Home / 81,519.85-122,279.78-78,567.40

Finding the Fourth Proportional to 81,519.85, 122,279.78 and 78,567.40

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Solution

The fourth proportional to 81,519.85, 122,279.78 and 78,567.40 is: 117,851.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,519.85 : 122,279.78 = 78,567.40 : x
  2. Step 2: Convert to fraction form
    81,519.85/122,279.78 = 78,567.40/x
  3. Step 3: Cross multiply
    81,519.85x = 122,279.78 × 78,567.40
  4. Step 4: Simplify right side
    81,519.85x = 9,607,203,994.34
  5. Step 5: Solve for x
    x = 9,607,203,994.34/81,519.85
  6. Step 6: Final answer
    x = 117,851.10

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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.