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Finding the Fourth Proportional to 1,405.44, 1,939.51 and 784.44

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Solution

The fourth proportional to 1,405.44, 1,939.51 and 784.44 is: 1,082.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.44 : 1,939.51 = 784.44 : x
  2. Step 2: Convert to fraction form
    1,405.44/1,939.51 = 784.44/x
  3. Step 3: Cross multiply
    1,405.44x = 1,939.51 × 784.44
  4. Step 4: Simplify right side
    1,405.44x = 1,521,429.22
  5. Step 5: Solve for x
    x = 1,521,429.22/1,405.44
  6. Step 6: Final answer
    x = 1,082.53

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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.