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Finding the Fourth Proportional to 1,275.23, 1,912.86 and 350.78

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Solution

The fourth proportional to 1,275.23, 1,912.86 and 350.78 is: 526.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.23 : 1,912.86 = 350.78 : x
  2. Step 2: Convert to fraction form
    1,275.23/1,912.86 = 350.78/x
  3. Step 3: Cross multiply
    1,275.23x = 1,912.86 × 350.78
  4. Step 4: Simplify right side
    1,275.23x = 670,983.47
  5. Step 5: Solve for x
    x = 670,983.47/1,275.23
  6. Step 6: Final answer
    x = 526.17

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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.