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Finding the Fourth Proportional to 1,020.64, 1,408.50 and 554.90

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Solution

The fourth proportional to 1,020.64, 1,408.50 and 554.90 is: 765.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.64 : 1,408.50 = 554.90 : x
  2. Step 2: Convert to fraction form
    1,020.64/1,408.50 = 554.90/x
  3. Step 3: Cross multiply
    1,020.64x = 1,408.50 × 554.90
  4. Step 4: Simplify right side
    1,020.64x = 781,576.65
  5. Step 5: Solve for x
    x = 781,576.65/1,020.64
  6. Step 6: Final answer
    x = 765.77

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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.