Home / 81,971.10-122,956.65-78,515.10

Finding the Fourth Proportional to 81,971.10, 122,956.65 and 78,515.10

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Solution

The fourth proportional to 81,971.10, 122,956.65 and 78,515.10 is: 117,772.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,971.10 : 122,956.65 = 78,515.10 : x
  2. Step 2: Convert to fraction form
    81,971.10/122,956.65 = 78,515.10/x
  3. Step 3: Cross multiply
    81,971.10x = 122,956.65 × 78,515.10
  4. Step 4: Simplify right side
    81,971.10x = 9,653,953,670.42
  5. Step 5: Solve for x
    x = 9,653,953,670.42/81,971.10
  6. Step 6: Final answer
    x = 117,772.65

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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.