Home / 78,145.56-117,234.54-31,402.08

Finding the Fourth Proportional to 78,145.56, 117,234.54 and 31,402.08

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Solution

The fourth proportional to 78,145.56, 117,234.54 and 31,402.08 is: 47,109.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,145.56 : 117,234.54 = 31,402.08 : x
  2. Step 2: Convert to fraction form
    78,145.56/117,234.54 = 31,402.08/x
  3. Step 3: Cross multiply
    78,145.56x = 117,234.54 × 31,402.08
  4. Step 4: Simplify right side
    78,145.56x = 3,681,408,403.84
  5. Step 5: Solve for x
    x = 3,681,408,403.84/78,145.56
  6. Step 6: Final answer
    x = 47,109.63

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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.