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Finding the Fourth Proportional to 1,274.68, 1,909.53 and 878.43

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Solution

The fourth proportional to 1,274.68, 1,909.53 and 878.43 is: 1,315.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.68 : 1,909.53 = 878.43 : x
  2. Step 2: Convert to fraction form
    1,274.68/1,909.53 = 878.43/x
  3. Step 3: Cross multiply
    1,274.68x = 1,909.53 × 878.43
  4. Step 4: Simplify right side
    1,274.68x = 1,677,378.89
  5. Step 5: Solve for x
    x = 1,677,378.89/1,274.68
  6. Step 6: Final answer
    x = 1,315.92

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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.