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Finding the Fourth Proportional to 128,563.42, 177,407.67 and 71,967.10

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Solution

The fourth proportional to 128,563.42, 177,407.67 and 71,967.10 is: 99,309.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,563.42 : 177,407.67 = 71,967.10 : x
  2. Step 2: Convert to fraction form
    128,563.42/177,407.67 = 71,967.10/x
  3. Step 3: Cross multiply
    128,563.42x = 177,407.67 × 71,967.10
  4. Step 4: Simplify right side
    128,563.42x = 12,767,515,527.66
  5. Step 5: Solve for x
    x = 12,767,515,527.66/128,563.42
  6. Step 6: Final answer
    x = 99,309.08

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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.