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Finding the Fourth Proportional to 86,493.60, 129,740.40 and 72,496.80

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Solution

The fourth proportional to 86,493.60, 129,740.40 and 72,496.80 is: 108,745.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,493.60 : 129,740.40 = 72,496.80 : x
  2. Step 2: Convert to fraction form
    86,493.60/129,740.40 = 72,496.80/x
  3. Step 3: Cross multiply
    86,493.60x = 129,740.40 × 72,496.80
  4. Step 4: Simplify right side
    86,493.60x = 9,405,763,830.72
  5. Step 5: Solve for x
    x = 9,405,763,830.72/86,493.60
  6. Step 6: Final answer
    x = 108,745.20

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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.