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Finding the Fourth Proportional to 649.40, 973.38 and 405.58

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Solution

The fourth proportional to 649.40, 973.38 and 405.58 is: 607.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.40 : 973.38 = 405.58 : x
  2. Step 2: Convert to fraction form
    649.40/973.38 = 405.58/x
  3. Step 3: Cross multiply
    649.40x = 973.38 × 405.58
  4. Step 4: Simplify right side
    649.40x = 394,783.46
  5. Step 5: Solve for x
    x = 394,783.46/649.40
  6. Step 6: Final answer
    x = 607.92

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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.