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Finding the Fourth Proportional to 669.30, 923.64 and 389.55

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Solution

The fourth proportional to 669.30, 923.64 and 389.55 is: 537.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.30 : 923.64 = 389.55 : x
  2. Step 2: Convert to fraction form
    669.30/923.64 = 389.55/x
  3. Step 3: Cross multiply
    669.30x = 923.64 × 389.55
  4. Step 4: Simplify right side
    669.30x = 359,803.96
  5. Step 5: Solve for x
    x = 359,803.96/669.30
  6. Step 6: Final answer
    x = 537.58

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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.