Home / 78,431.88-117,670.91-28,511.19

Finding the Fourth Proportional to 78,431.88, 117,670.91 and 28,511.19

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Solution

The fourth proportional to 78,431.88, 117,670.91 and 28,511.19 is: 42,775.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,431.88 : 117,670.91 = 28,511.19 : x
  2. Step 2: Convert to fraction form
    78,431.88/117,670.91 = 28,511.19/x
  3. Step 3: Cross multiply
    78,431.88x = 117,670.91 × 28,511.19
  4. Step 4: Simplify right side
    78,431.88x = 3,354,937,529.93
  5. Step 5: Solve for x
    x = 3,354,937,529.93/78,431.88
  6. Step 6: Final answer
    x = 42,775.18

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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.