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Finding the Fourth Proportional to 1,405.63, 1,939.77 and 784.63

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Solution

The fourth proportional to 1,405.63, 1,939.77 and 784.63 is: 1,082.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.63 : 1,939.77 = 784.63 : x
  2. Step 2: Convert to fraction form
    1,405.63/1,939.77 = 784.63/x
  3. Step 3: Cross multiply
    1,405.63x = 1,939.77 × 784.63
  4. Step 4: Simplify right side
    1,405.63x = 1,521,988.11
  5. Step 5: Solve for x
    x = 1,521,988.11/1,405.63
  6. Step 6: Final answer
    x = 1,082.78

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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.