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Finding the Fourth Proportional to 669.88, 930.63 and 663.87

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Solution

The fourth proportional to 669.88, 930.63 and 663.87 is: 922.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.88 : 930.63 = 663.87 : x
  2. Step 2: Convert to fraction form
    669.88/930.63 = 663.87/x
  3. Step 3: Cross multiply
    669.88x = 930.63 × 663.87
  4. Step 4: Simplify right side
    669.88x = 617,823.32
  5. Step 5: Solve for x
    x = 617,823.32/669.88
  6. Step 6: Final answer
    x = 922.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.