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Finding the Fourth Proportional to 669.93, 999.99 and 618.90

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Solution

The fourth proportional to 669.93, 999.99 and 618.90 is: 923.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.93 : 999.99 = 618.90 : x
  2. Step 2: Convert to fraction form
    669.93/999.99 = 618.90/x
  3. Step 3: Cross multiply
    669.93x = 999.99 × 618.90
  4. Step 4: Simplify right side
    669.93x = 618,893.81
  5. Step 5: Solve for x
    x = 618,893.81/669.93
  6. Step 6: Final answer
    x = 923.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.