Home / 78,586.23-117,878.19-19,421.90

Finding the Fourth Proportional to 78,586.23, 117,878.19 and 19,421.90

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Solution

The fourth proportional to 78,586.23, 117,878.19 and 19,421.90 is: 29,132.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,586.23 : 117,878.19 = 19,421.90 : x
  2. Step 2: Convert to fraction form
    78,586.23/117,878.19 = 19,421.90/x
  3. Step 3: Cross multiply
    78,586.23x = 117,878.19 × 19,421.90
  4. Step 4: Simplify right side
    78,586.23x = 2,289,418,713.06
  5. Step 5: Solve for x
    x = 2,289,418,713.06/78,586.23
  6. Step 6: Final answer
    x = 29,132.57

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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.