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Finding the Fourth Proportional to 1,405.02, 1,939.11 and 784.14

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Solution

The fourth proportional to 1,405.02, 1,939.11 and 784.14 is: 1,082.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.02 : 1,939.11 = 784.14 : x
  2. Step 2: Convert to fraction form
    1,405.02/1,939.11 = 784.14/x
  3. Step 3: Cross multiply
    1,405.02x = 1,939.11 × 784.14
  4. Step 4: Simplify right side
    1,405.02x = 1,520,533.72
  5. Step 5: Solve for x
    x = 1,520,533.72/1,405.02
  6. Step 6: Final answer
    x = 1,082.21

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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.