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Finding the Fourth Proportional to 1,273.63, 1,910.53 and 407.88

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Solution

The fourth proportional to 1,273.63, 1,910.53 and 407.88 is: 611.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.63 : 1,910.53 = 407.88 : x
  2. Step 2: Convert to fraction form
    1,273.63/1,910.53 = 407.88/x
  3. Step 3: Cross multiply
    1,273.63x = 1,910.53 × 407.88
  4. Step 4: Simplify right side
    1,273.63x = 779,264.94
  5. Step 5: Solve for x
    x = 779,264.94/1,273.63
  6. Step 6: Final answer
    x = 611.85

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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.