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Finding the Fourth Proportional to 1,123.24, 1,684.29 and 713.20

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Solution

The fourth proportional to 1,123.24, 1,684.29 and 713.20 is: 1,069.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.24 : 1,684.29 = 713.20 : x
  2. Step 2: Convert to fraction form
    1,123.24/1,684.29 = 713.20/x
  3. Step 3: Cross multiply
    1,123.24x = 1,684.29 × 713.20
  4. Step 4: Simplify right side
    1,123.24x = 1,201,235.63
  5. Step 5: Solve for x
    x = 1,201,235.63/1,123.24
  6. Step 6: Final answer
    x = 1,069.44

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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.