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Finding the Fourth Proportional to 86,288.80, 129,448.40 and 35,687.68

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Solution

The fourth proportional to 86,288.80, 129,448.40 and 35,687.68 is: 53,537.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,288.80 : 129,448.40 = 35,687.68 : x
  2. Step 2: Convert to fraction form
    86,288.80/129,448.40 = 35,687.68/x
  3. Step 3: Cross multiply
    86,288.80x = 129,448.40 × 35,687.68
  4. Step 4: Simplify right side
    86,288.80x = 4,619,713,075.71
  5. Step 5: Solve for x
    x = 4,619,713,075.71/86,288.80
  6. Step 6: Final answer
    x = 53,537.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.