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Finding the Fourth Proportional to 1,272.28, 1,908.54 and 347.90

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Solution

The fourth proportional to 1,272.28, 1,908.54 and 347.90 is: 521.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.28 : 1,908.54 = 347.90 : x
  2. Step 2: Convert to fraction form
    1,272.28/1,908.54 = 347.90/x
  3. Step 3: Cross multiply
    1,272.28x = 1,908.54 × 347.90
  4. Step 4: Simplify right side
    1,272.28x = 663,981.07
  5. Step 5: Solve for x
    x = 663,981.07/1,272.28
  6. Step 6: Final answer
    x = 521.88

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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.