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Finding the Fourth Proportional to 136,685.80, 205,028.70 and 38,189.80

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Solution

The fourth proportional to 136,685.80, 205,028.70 and 38,189.80 is: 57,284.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,685.80 : 205,028.70 = 38,189.80 : x
  2. Step 2: Convert to fraction form
    136,685.80/205,028.70 = 38,189.80/x
  3. Step 3: Cross multiply
    136,685.80x = 205,028.70 × 38,189.80
  4. Step 4: Simplify right side
    136,685.80x = 7,830,005,047.26
  5. Step 5: Solve for x
    x = 7,830,005,047.26/136,685.80
  6. Step 6: Final answer
    x = 57,284.70

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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.