Home / 138,680.16-191,367.73-78,265.50

Finding the Fourth Proportional to 138,680.16, 191,367.73 and 78,265.50

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Solution

The fourth proportional to 138,680.16, 191,367.73 and 78,265.50 is: 108,000.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,680.16 : 191,367.73 = 78,265.50 : x
  2. Step 2: Convert to fraction form
    138,680.16/191,367.73 = 78,265.50/x
  3. Step 3: Cross multiply
    138,680.16x = 191,367.73 × 78,265.50
  4. Step 4: Simplify right side
    138,680.16x = 14,977,491,072.32
  5. Step 5: Solve for x
    x = 14,977,491,072.32/138,680.16
  6. Step 6: Final answer
    x = 108,000.24

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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.