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Finding the Fourth Proportional to 1,020.44, 1,406.82 and 647.23

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Solution

The fourth proportional to 1,020.44, 1,406.82 and 647.23 is: 892.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.44 : 1,406.82 = 647.23 : x
  2. Step 2: Convert to fraction form
    1,020.44/1,406.82 = 647.23/x
  3. Step 3: Cross multiply
    1,020.44x = 1,406.82 × 647.23
  4. Step 4: Simplify right side
    1,020.44x = 910,536.11
  5. Step 5: Solve for x
    x = 910,536.11/1,020.44
  6. Step 6: Final answer
    x = 892.30

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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.