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Finding the Fourth Proportional to 745.97, 1,029.56 and 621.43

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Solution

The fourth proportional to 745.97, 1,029.56 and 621.43 is: 857.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.97 : 1,029.56 = 621.43 : x
  2. Step 2: Convert to fraction form
    745.97/1,029.56 = 621.43/x
  3. Step 3: Cross multiply
    745.97x = 1,029.56 × 621.43
  4. Step 4: Simplify right side
    745.97x = 639,793.79
  5. Step 5: Solve for x
    x = 639,793.79/745.97
  6. Step 6: Final answer
    x = 857.67

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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.