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Finding the Fourth Proportional to 1,273.12, 1,909.86 and 407.56

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Solution

The fourth proportional to 1,273.12, 1,909.86 and 407.56 is: 611.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.12 : 1,909.86 = 407.56 : x
  2. Step 2: Convert to fraction form
    1,273.12/1,909.86 = 407.56/x
  3. Step 3: Cross multiply
    1,273.12x = 1,909.86 × 407.56
  4. Step 4: Simplify right side
    1,273.12x = 778,382.54
  5. Step 5: Solve for x
    x = 778,382.54/1,273.12
  6. Step 6: Final answer
    x = 611.40

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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.