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Finding the Fourth Proportional to 1,020.39, 1,408.11 and 554.64

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Solution

The fourth proportional to 1,020.39, 1,408.11 and 554.64 is: 765.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.39 : 1,408.11 = 554.64 : x
  2. Step 2: Convert to fraction form
    1,020.39/1,408.11 = 554.64/x
  3. Step 3: Cross multiply
    1,020.39x = 1,408.11 × 554.64
  4. Step 4: Simplify right side
    1,020.39x = 780,994.13
  5. Step 5: Solve for x
    x = 780,994.13/1,020.39
  6. Step 6: Final answer
    x = 765.39

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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.