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Finding the Fourth Proportional to 136,710.63, 205,197.30 and 66,639.15

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Solution

The fourth proportional to 136,710.63, 205,197.30 and 66,639.15 is: 100,022.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,710.63 : 205,197.30 = 66,639.15 : x
  2. Step 2: Convert to fraction form
    136,710.63/205,197.30 = 66,639.15/x
  3. Step 3: Cross multiply
    136,710.63x = 205,197.30 × 66,639.15
  4. Step 4: Simplify right side
    136,710.63x = 13,674,173,654.30
  5. Step 5: Solve for x
    x = 13,674,173,654.30/136,710.63
  6. Step 6: Final answer
    x = 100,022.75

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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.