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Finding the Fourth Proportional to 649.10, 972.93 and 389.45

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Solution

The fourth proportional to 649.10, 972.93 and 389.45 is: 583.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.10 : 972.93 = 389.45 : x
  2. Step 2: Convert to fraction form
    649.10/972.93 = 389.45/x
  3. Step 3: Cross multiply
    649.10x = 972.93 × 389.45
  4. Step 4: Simplify right side
    649.10x = 378,907.59
  5. Step 5: Solve for x
    x = 378,907.59/649.10
  6. Step 6: Final answer
    x = 583.74

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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.