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Finding the Fourth Proportional to 1,275.68, 1,914.10 and 756.72

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Solution

The fourth proportional to 1,275.68, 1,914.10 and 756.72 is: 1,135.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.68 : 1,914.10 = 756.72 : x
  2. Step 2: Convert to fraction form
    1,275.68/1,914.10 = 756.72/x
  3. Step 3: Cross multiply
    1,275.68x = 1,914.10 × 756.72
  4. Step 4: Simplify right side
    1,275.68x = 1,448,437.75
  5. Step 5: Solve for x
    x = 1,448,437.75/1,275.68
  6. Step 6: Final answer
    x = 1,135.42

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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.