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Finding the Fourth Proportional to 669.42, 922.59 and 638.37

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Solution

The fourth proportional to 669.42, 922.59 and 638.37 is: 879.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.42 : 922.59 = 638.37 : x
  2. Step 2: Convert to fraction form
    669.42/922.59 = 638.37/x
  3. Step 3: Cross multiply
    669.42x = 922.59 × 638.37
  4. Step 4: Simplify right side
    669.42x = 588,953.78
  5. Step 5: Solve for x
    x = 588,953.78/669.42
  6. Step 6: Final answer
    x = 879.80

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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.