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Finding the Fourth Proportional to 1,517.21, 2,275.03 and 776.70

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Solution

The fourth proportional to 1,517.21, 2,275.03 and 776.70 is: 1,164.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,517.21 : 2,275.03 = 776.70 : x
  2. Step 2: Convert to fraction form
    1,517.21/2,275.03 = 776.70/x
  3. Step 3: Cross multiply
    1,517.21x = 2,275.03 × 776.70
  4. Step 4: Simplify right side
    1,517.21x = 1,767,016.77
  5. Step 5: Solve for x
    x = 1,767,016.77/1,517.21
  6. Step 6: Final answer
    x = 1,164.65

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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.