Home / 78,985.26-108,999.54-47,172.78

Finding the Fourth Proportional to 78,985.26, 108,999.54 and 47,172.78

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Solution

The fourth proportional to 78,985.26, 108,999.54 and 47,172.78 is: 65,098.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,985.26 : 108,999.54 = 47,172.78 : x
  2. Step 2: Convert to fraction form
    78,985.26/108,999.54 = 47,172.78/x
  3. Step 3: Cross multiply
    78,985.26x = 108,999.54 × 47,172.78
  4. Step 4: Simplify right side
    78,985.26x = 5,141,811,320.52
  5. Step 5: Solve for x
    x = 5,141,811,320.52/78,985.26
  6. Step 6: Final answer
    x = 65,098.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.