Home / 78,639.21-117,842.15-57,760.65

Finding the Fourth Proportional to 78,639.21, 117,842.15 and 57,760.65

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Solution

The fourth proportional to 78,639.21, 117,842.15 and 57,760.65 is: 86,555.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,639.21 : 117,842.15 = 57,760.65 : x
  2. Step 2: Convert to fraction form
    78,639.21/117,842.15 = 57,760.65/x
  3. Step 3: Cross multiply
    78,639.21x = 117,842.15 × 57,760.65
  4. Step 4: Simplify right side
    78,639.21x = 6,806,639,181.40
  5. Step 5: Solve for x
    x = 6,806,639,181.40/78,639.21
  6. Step 6: Final answer
    x = 86,555.28

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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.