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Finding the Fourth Proportional to 128,986.44, 177,991.51 and 72,386.88

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Solution

The fourth proportional to 128,986.44, 177,991.51 and 72,386.88 is: 99,888.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,986.44 : 177,991.51 = 72,386.88 : x
  2. Step 2: Convert to fraction form
    128,986.44/177,991.51 = 72,386.88/x
  3. Step 3: Cross multiply
    128,986.44x = 177,991.51 × 72,386.88
  4. Step 4: Simplify right side
    128,986.44x = 12,884,250,075.39
  5. Step 5: Solve for x
    x = 12,884,250,075.39/128,986.44
  6. Step 6: Final answer
    x = 99,888.41

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1.5x scale

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.