Home / 78,172.40-117,316.20-31,458.80

Finding the Fourth Proportional to 78,172.40, 117,316.20 and 31,458.80

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Solution

The fourth proportional to 78,172.40, 117,316.20 and 31,458.80 is: 47,211.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,172.40 : 117,316.20 = 31,458.80 : x
  2. Step 2: Convert to fraction form
    78,172.40/117,316.20 = 31,458.80/x
  3. Step 3: Cross multiply
    78,172.40x = 117,316.20 × 31,458.80
  4. Step 4: Simplify right side
    78,172.40x = 3,690,626,872.56
  5. Step 5: Solve for x
    x = 3,690,626,872.56/78,172.40
  6. Step 6: Final answer
    x = 47,211.38

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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.