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Finding the Fourth Proportional to 1,278.05, 1,763.25 and 947.03

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Solution

The fourth proportional to 1,278.05, 1,763.25 and 947.03 is: 1,306.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.05 : 1,763.25 = 947.03 : x
  2. Step 2: Convert to fraction form
    1,278.05/1,763.25 = 947.03/x
  3. Step 3: Cross multiply
    1,278.05x = 1,763.25 × 947.03
  4. Step 4: Simplify right side
    1,278.05x = 1,669,850.65
  5. Step 5: Solve for x
    x = 1,669,850.65/1,278.05
  6. Step 6: Final answer
    x = 1,306.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.