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Finding the Fourth Proportional to 1,275.19, 1,912.42 and 350.78

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Solution

The fourth proportional to 1,275.19, 1,912.42 and 350.78 is: 526.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.19 : 1,912.42 = 350.78 : x
  2. Step 2: Convert to fraction form
    1,275.19/1,912.42 = 350.78/x
  3. Step 3: Cross multiply
    1,275.19x = 1,912.42 × 350.78
  4. Step 4: Simplify right side
    1,275.19x = 670,827.37
  5. Step 5: Solve for x
    x = 670,827.37/1,275.19
  6. Step 6: Final answer
    x = 526.06

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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.