Home / 128,986.69-177,991.86-72,387.13

Finding the Fourth Proportional to 128,986.69, 177,991.86 and 72,387.13

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Solution

The fourth proportional to 128,986.69, 177,991.86 and 72,387.13 is: 99,888.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,986.69 : 177,991.86 = 72,387.13 : x
  2. Step 2: Convert to fraction form
    128,986.69/177,991.86 = 72,387.13/x
  3. Step 3: Cross multiply
    128,986.69x = 177,991.86 × 72,387.13
  4. Step 4: Simplify right side
    128,986.69x = 12,884,319,908.76
  5. Step 5: Solve for x
    x = 12,884,319,908.76/128,986.69
  6. Step 6: Final answer
    x = 99,888.76

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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.