Home / 128,436.85-177,235.72-71,837.29

Finding the Fourth Proportional to 128,436.85, 177,235.72 and 71,837.29

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Solution

The fourth proportional to 128,436.85, 177,235.72 and 71,837.29 is: 99,131.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,436.85 : 177,235.72 = 71,837.29 : x
  2. Step 2: Convert to fraction form
    128,436.85/177,235.72 = 71,837.29/x
  3. Step 3: Cross multiply
    128,436.85x = 177,235.72 × 71,837.29
  4. Step 4: Simplify right side
    128,436.85x = 12,732,133,816.00
  5. Step 5: Solve for x
    x = 12,732,133,816.00/128,436.85
  6. Step 6: Final answer
    x = 99,131.47

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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.