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Finding the Fourth Proportional to 649.12, 972.72 and 389.26

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Solution

The fourth proportional to 649.12, 972.72 and 389.26 is: 583.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.12 : 972.72 = 389.26 : x
  2. Step 2: Convert to fraction form
    649.12/972.72 = 389.26/x
  3. Step 3: Cross multiply
    649.12x = 972.72 × 389.26
  4. Step 4: Simplify right side
    649.12x = 378,640.99
  5. Step 5: Solve for x
    x = 378,640.99/649.12
  6. Step 6: Final answer
    x = 583.31

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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.