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Finding the Fourth Proportional to 1,038.50, 1,556.97 and 421.73

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Solution

The fourth proportional to 1,038.50, 1,556.97 and 421.73 is: 632.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.50 : 1,556.97 = 421.73 : x
  2. Step 2: Convert to fraction form
    1,038.50/1,556.97 = 421.73/x
  3. Step 3: Cross multiply
    1,038.50x = 1,556.97 × 421.73
  4. Step 4: Simplify right side
    1,038.50x = 656,620.96
  5. Step 5: Solve for x
    x = 656,620.96/1,038.50
  6. Step 6: Final answer
    x = 632.28

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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.