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Finding the Fourth Proportional to 128,652, 177,539.76 and 72,063.24

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Solution

The fourth proportional to 128,652, 177,539.76 and 72,063.24 is: 99,447.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,652 : 177,539.76 = 72,063.24 : x
  2. Step 2: Convert to fraction form
    128,652/177,539.76 = 72,063.24/x
  3. Step 3: Cross multiply
    128,652x = 177,539.76 × 72,063.24
  4. Step 4: Simplify right side
    128,652x = 12,794,090,334.42
  5. Step 5: Solve for x
    x = 12,794,090,334.42/128,652
  6. Step 6: Final answer
    x = 99,447.27

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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.