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Finding the Fourth Proportional to 649.92, 975.60 and 405.84

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Solution

The fourth proportional to 649.92, 975.60 and 405.84 is: 609.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.92 : 975.60 = 405.84 : x
  2. Step 2: Convert to fraction form
    649.92/975.60 = 405.84/x
  3. Step 3: Cross multiply
    649.92x = 975.60 × 405.84
  4. Step 4: Simplify right side
    649.92x = 395,937.50
  5. Step 5: Solve for x
    x = 395,937.50/649.92
  6. Step 6: Final answer
    x = 609.21

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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.