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Finding the Fourth Proportional to 1,815.56, 2,719.80 and 947.78

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Solution

The fourth proportional to 1,815.56, 2,719.80 and 947.78 is: 1,419.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.56 : 2,719.80 = 947.78 : x
  2. Step 2: Convert to fraction form
    1,815.56/2,719.80 = 947.78/x
  3. Step 3: Cross multiply
    1,815.56x = 2,719.80 × 947.78
  4. Step 4: Simplify right side
    1,815.56x = 2,577,772.04
  5. Step 5: Solve for x
    x = 2,577,772.04/1,815.56
  6. Step 6: Final answer
    x = 1,419.82

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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.