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Finding the Fourth Proportional to 123,907.20, 170,992.16 and 67,318.64

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Solution

The fourth proportional to 123,907.20, 170,992.16 and 67,318.64 is: 92,899.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,907.20 : 170,992.16 = 67,318.64 : x
  2. Step 2: Convert to fraction form
    123,907.20/170,992.16 = 67,318.64/x
  3. Step 3: Cross multiply
    123,907.20x = 170,992.16 × 67,318.64
  4. Step 4: Simplify right side
    123,907.20x = 11,510,959,661.86
  5. Step 5: Solve for x
    x = 11,510,959,661.86/123,907.20
  6. Step 6: Final answer
    x = 92,899.84

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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.