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Finding the Fourth Proportional to 669.88, 923.94 and 492.90

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Solution

The fourth proportional to 669.88, 923.94 and 492.90 is: 679.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.88 : 923.94 = 492.90 : x
  2. Step 2: Convert to fraction form
    669.88/923.94 = 492.90/x
  3. Step 3: Cross multiply
    669.88x = 923.94 × 492.90
  4. Step 4: Simplify right side
    669.88x = 455,410.03
  5. Step 5: Solve for x
    x = 455,410.03/669.88
  6. Step 6: Final answer
    x = 679.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.