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Finding the Fourth Proportional to 497.70, 745.20 and 389.70

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Solution

The fourth proportional to 497.70, 745.20 and 389.70 is: 583.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    497.70 : 745.20 = 389.70 : x
  2. Step 2: Convert to fraction form
    497.70/745.20 = 389.70/x
  3. Step 3: Cross multiply
    497.70x = 745.20 × 389.70
  4. Step 4: Simplify right side
    497.70x = 290,404.44
  5. Step 5: Solve for x
    x = 290,404.44/497.70
  6. Step 6: Final answer
    x = 583.49

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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.